"Saezuru Tori wa Habatakanai" (also known as "Twittering Birds Never Fly") by Kou Yoneda is indeed a dark Boys' Love (BL) manga. It is known for its mature themes, complex characters, and exploration of dark and intense emotions.

The story follows Yashiro, a yakuza boss with a troubled past and a deep-seated desire for pain and submission. He forms a complex and twisted relationship with Doumeki, a stoic and unyielding bodyguard who becomes entangled in Yashiro's world. Together, they navigate the dark underbelly of the criminal underworld, exploring themes of power dynamics, emotional pain, and the complexities of human desire.

"Saezuru Tori wa Habatakanai" delves into the psychological struggles of the characters, examining their past traumas, inner demons, and the emotional walls they have built around themselves. The manga portrays their evolving relationship, which is filled with intense moments, power struggles, and moments of vulnerability.

The art style of "Saezuru Tori wa Habatakanai" perfectly complements the dark and emotional atmosphere of the story. The illustrations effectively capture the nuances of the characters' expressions and emotions, adding depth to the narrative.

Author: Kou Yoneda
Genre: Boy's love, Dark

Original run: August 1, 2011 – present
Volumes: 8

Read here: https://w.mangairo.com/story-ek249044/chapter-1

"Under (xGround) Grand Hotel" is a dark and intense Boys' Love (BL) manga that takes place within the confines of a maximum-security prison. The story revolves around Sen Owari, an experienced inmate who has spent many years in the prison, and Swordfish, a new and mysterious prisoner.

As the story unfolds, Sen and Swordfish's paths cross, and they develop a complex and compelling relationship. Through their interactions, the manga explores themes of power dynamics, manipulation, trust, survival, and the depths of human emotions. The setting of the prison adds a gritty and oppressive atmosphere to the story, creating a tense and suspenseful narrative. The characters face various challenges and obstacles within the prison environment, which further tests their bond and pushes them to their limits.

"Under (xGround) Grand Hotel" is known for its explicit and mature content, including explicit sexual scenes and violence. The manga tackles darker themes and does not shy away from exploring the complexities of human nature and the consequences of one's actions.

Author: Sadahiro mika
Genres: Yaoi(BL) , Drama , Tragedy

Original run: April 25, 2003 – October 25, 2005

Volumes: 3

Read here: https://mangatoto.com/series/53955

"Deadlock" is a dark Boys' Love (BL) manga written by Aida Saki and illustrated by Takashina Yuu. It is known for its intense storyline, complex characters, and elements of action and suspense. The story of "Deadlock" revolves around two protagonists, Gisele Lang and Dirk Muller, who find themselves entangled in a dangerous and intricate web of crime and conspiracy.

Gisele is a skilled hacker and former assassin seeking revenge against a powerful organization known as "Deadlock." Dirk is a detective with a troubled past and a strong sense of justice. Their paths cross when Gisele becomes a key figure in Dirk's investigation.

As Gisele and Dirk work together, they uncover dark secrets, face deadly adversaries, and navigate through a world where trust is scarce. The manga explores themes of betrayal, redemption, and the blurred lines between right and wrong. The relationship between Gisele and Dirk evolves throughout the series, gradually building trust and deepening their connection.

"Deadlock" features intense action sequences, psychological twists, and strategic battles as the characters navigate through a dangerous underworld. The art style of the manga captures the intensity and grittiness of the story, enhancing the overall atmosphere.

Author: Aida, Saki

Genres: Action, Drama, Mystery, Yaoi

Original runs: December 22, 2011 - August 22, 2019

Chapters: 19

Read here: https://yaoiscan.com/read/deadlock/chapter-1/

"Caste Heaven" is a dark Boys' Love (BL) manga written and illustrated by Chise Ogawa. It is known for its intense and dramatic storyline set within a twisted hierarchy system at a prestigious boys' school.

The manga revolves around Azusa, a transfer student who becomes entangled in a cruel game that dominates the school called the "Caste Game." In this game, students are ranked based on their popularity and social status, with the lowest caste being subjected to various forms of mistreatment and bullying by those in higher castes. Azusa finds himself at the bottom of the caste system, constantly targeted and abused by his classmates.

The story explores themes of power dynamics, manipulation, and survival within the school's oppressive environment. As Azusa navigates the treacherous game, he encounters Karino, a popular and charismatic student who holds a position of authority. Their relationship evolves as they both struggle with their own secrets and desires.

"Caste Heaven" delves into dark and psychological elements, highlighting the twisted nature of the school's hierarchy and the lengths individuals will go to maintain or improve their status. The manga portrays the characters' emotional struggles, the consequences of their actions, and the impact of the caste system on their lives.

Author: Chise Ogawa

Genre: Yaoi

Original run: March 2014 – 2021
Volumes: 8

Read here: https://ww7.manganelo.tv/manga/manga-wy953581

"Wild Adapter" is a dark Boys' Love (BL) manga series written by Kazuya Minekura. Known for its gritty atmosphere and complex characters, it combines elements of crime, action, and supernatural elements. The story follows Makoto Kubota, a young man who finds himself involved in the criminal underworld after accidentally coming into possession of a mysterious drug known as "Wild Adapter." This drug grants him enhanced strength and regenerative abilities. He forms an unlikely partnership with a stoic and mysterious man named Minoru Tokito, who has his own connections to the criminal world.

As Makoto and Minoru navigate the dangerous and violent world they find themselves in, they become embroiled in various criminal activities, unraveling conspiracies and facing dangerous adversaries. The manga explores themes of power, morality, and the blurred lines between good and evil.

"Wild Adapter" is known for its dark and gritty atmosphere, portraying the seedy underbelly of society and the psychological struggles of its characters. It features intense action sequences, violence, and mature themes. While the manga contains BL elements, the focus is primarily on the crime and suspense aspects of the story.

Author: Kazuya Minekura

Genre: Action, Mystery, Film Noir

Original run: 2001 – 2015

Volumes: 7

Read here: https://www.novelcool.com/chapter/Ch-0-Extra/3343440/

"Double Mints" is a dark Boys' Love manga penned by Asumiko Nakamura that delves into psychological themes and presents a complex relationship between two main characters. The story follows the chance encounter and subsequent friendship of Asahi and Tachibana, two individuals with contrasting personalities. As their bond deepens, they unravel shared secrets and confront a dark past that connects them.

The manga explores the intricate emotional struggles of the characters, touching upon identity, trust, and the consequences of past actions. Nakamura's distinctive art style, characterized by striking visuals and atmospheric panels, intensifies the story's dark tone. "Double Mints" tackles sensitive subjects and incorporates explicit sexual scenes and themes of trauma, making it suitable for mature readers.

Overall, the manga offers a thought-provoking and visually captivating exploration of psychological depths and intricate character dynamics within the realm of Boys' Love.

Author: Nakamura, Asumiko

Genres: Yaoi, Drama

Original run: July 24, 2009

Volumes: 1

Read here: https://mangafire.to/manga/double-mints.kkov

"Acid Town" is a dark Boys' Love (BL) manga created by Kyuugo. It takes place in a dystopian setting and delves into themes of crime, violence, and complex relationships.

"Acid Town" is a gritty and atmospheric BL manga set in a dystopian city plagued by crime and corruption. The story follows the life of a young man named Tooru, who finds himself caught up in the dangerous world of a notorious gang called the Jackal. Tooru becomes entangled with Mookyul, a charismatic and enigmatic member of the gang. As their paths intertwine, they navigate the treacherous underbelly of the city and face the challenges posed by rival gangs and law enforcement.

In "Acid Town," the manga explores the dark and violent aspects of the characters' lives and the struggles they endure in a harsh and unforgiving environment. It delves into complex relationships, power dynamics, and the consequences of choices made in such a brutal world.

Author: Kyuugou

Genre: Yaoi

Original run: March 22, 2008

Volume: 1

Read here: https://ww7.manganelo.tv/chapter/manga-lx951732/chapter-1

"Kohitsuji Project" is a Boys' Love (BL) manga series written and illustrated by Sakurako Gokurakuin. It falls within the romance and comedy genres, with a darker undertone. "Kohitsuji Project" follows the story of Ritsuka Aoyagi, a young man who is wrongly accused of stealing valuable artwork and is forced into a position as a servant in the prestigious school, Shichisei Academy.

The school is populated by rich and powerful students known as the "Seven Sins," each representing one of the deadly sins. Ritsuka is assigned to serve one of the Seven Sins, who turns out to be a handsome and mysterious young man named Rem Kaginuki.

As Ritsuka navigates his new role as a servant, he gradually becomes entangled in the secrets and dark pasts of the Seven Sins. The manga explores the relationships between Ritsuka and the various members of the Seven Sins, delving into their personal struggles, hidden desires, and emotional vulnerabilities. Through comedic and romantic moments, the story unfolds with a mix of lightheartedness and underlying darkness.

While "Kohitsuji Project" has a BL setting and includes romantic elements between male characters, it also incorporates comedic aspects and a touch of mystery. It explores themes of trust, redemption, and self-discovery within the context of a school filled with intriguing and flawed characters.

Author: Sei Takenaka

Genre: Yaoi

Original run: 2010 - 2012

Volume: 1

Read here: https://ww7.mangakakalot.tv/chapter/manga-ag956615/chapter-1

"Finder Series," also known as "Finder no Hyouteki," is a popular Boys' Love (BL) manga written and illustrated by Ayano Yamane. It falls within the romance, drama, and suspense genres, and is known for its dark and intense storyline.

"Finder Series" revolves around the complex relationship between two main characters: Akihito Takaba, a young and tenacious photographer, and Ryuichi Asami, a powerful and enigmatic crime lord. The manga is set in the world of crime, corruption, and illicit activities.

Akihito stumbles upon a dangerous secret while investigating a news story, and he becomes the target of Asami's ruthless power. Asami, known as "the black marketeer," is captivated by Akihito's spirit and unwillingness to back down. Their initial encounters spark a tumultuous relationship filled with danger, power struggles, and intense emotions.

The "Finder Series" explores themes of power dynamics, obsession, and the thin line between love and manipulation. It delves into the dark side of society, involving criminal organizations, human trafficking, and political corruption. As the story progresses, Akihito and Asami's relationship evolves, and they must navigate treacherous situations and face their own vulnerabilities.

Author: Ayano Yamane

Genre: Crime, Erotic thriller, Yaoi

Original run: 2002 – present
Volumes: 13

Read here: https://ww7.manganelo.tv/manga/manga-ym953795

"Vassalord" is a dark Boys' Love (BL) manga series created by Nanae Chrono. It combines elements of the supernatural, action, and romance genres. "Vassalord" follows the story of a vampire named Charley Chrishunds, who works as a vampire hunter for the Vatican. Charley is a centuries-old vampire with a tragic past and a complex relationship with his vampiric instincts. He is partnered with the cyborg detective, Johnny Rayflo, who also happens to be a vampire himself.

Together, Charley and Johnny embark on various missions to eliminate rogue vampires and supernatural threats while uncovering the dark secrets of Charley's past. As they navigate through dangerous encounters and supernatural battles, their relationship evolves and becomes entangled in a mix of loyalty, desire, and secrets.

The manga explores themes of redemption, immortality, and the blurred lines between good and evil. It delves into the psychological struggles of Charley as he grapples with his vampiric nature and the moral implications of his actions. The story also delves into the complex dynamics between Charley and Johnny as they navigate their partnership and the feelings that arise between them.

Author: Nanae Chrono

Genre: Action, Supernatural, BL

Original run: March 30, 2006 – March 15, 2013
Volumes: 7

Read here: https://ww7.mangakakalot.tv/manga/manga-gc957237

"Bloody†Mary" is a dark Boys' Love (BL) manga series written and illustrated by Akaza Samamiya. It falls within the genres of supernatural, action, and romance. "Bloody†Mary" centers around the story of a high school student named Maria Kuroshitsuji, who becomes entangled with the enigmatic vampire, Mary. Maria is plagued by a curse that causes him to attract vampires and suffer from their attacks. In a twist of fate, he accidentally awakens Mary, a powerful vampire with a mysterious past.

Together, Maria and Mary embark on a journey to find a way to break Maria's curse. Along the way, they encounter other vampires, supernatural beings, and uncover dark secrets within the vampire community. As their bond deepens, they face challenges and threats that test their trust and resolve.

The manga explores themes of identity, loyalty, and the consequences of immortality. It delves into the complexities of the vampire world and the struggles faced by its characters as they navigate their own desires and the dangers of their existence.

Author: Akaza Samamiya

Genres: Shōnen'ai, Sentimental, Fantasy

Original run: 30 March 2016 – 25 October 2017

Volumes: 10

Read here: https://www.novelcool.com/chapter/Chapter-1/2787187/

"Endless World" is a Boys' Love (BL) manga series created by Takako Shimura. It falls within the genres of romance, drama, and supernatural. "Endless World" tells the story of Kai and Hikaru, two boys who are close childhood friends. However, their lives take a dramatic turn when Kai is involved in a tragic accident and loses his memory. Unbeknownst to Hikaru, Kai possesses a unique ability—he can travel through time and space, experiencing different moments in history.

As Kai struggles to regain his memories and understand his mysterious power, Hikaru remains steadfast in his support. Their relationship deepens as they navigate the challenges presented by Kai's ability and the impact it has on their lives. The manga explores themes of love, friendship, and the complexities of identity.

While "Endless World" includes supernatural elements, the focus of the story is on the emotional journey of the characters and the development of their relationship. It delves into their personal growth, the challenges they face, and the bonds they form with others along the way.

Author: Jaryuu, Dokuro

Genres: Yaoi, Drama

Original run: 2008

Volume: 1

Read here: https://mangahub.io/chapter/endless-world/chapter-1