"High School DxD" is an action harem anime series that follows the life of Issei Hyoudou, a high school student who gets an unexpected second chance at life. The story begins when Issei, a perverted and socially awkward young man, is killed by a fallen angel on a date. But instead of staying dead, he returns to life because a beautiful devil named Rias Gremory brings him back. Issei becomes Rias's helper in the devil's world.

Issei has to adjust to being a devil and deal with supernatural creatures like angels, fallen angels, and demons. He joins a club at Kuoh Academy called the Occult Research Club, where Rias is the leader. Issei discovers that Rias and her club members are also devils with unique powers, and he gets involved in their fights and adventures.

As the story goes on, Issei develops his special powers and gets into battles with other supernatural beings. At the same time, he forms close relationships with the girls in the Occult Research Club, and they all have feelings for him. These romantic and comedic elements are significant to the anime's appeal.

"High School DxD" is known for its mix of supernatural battles, adult humor, and a guy surrounded by girls. But it also explores themes like loyalty, friendship, and personal growth as Issei and his friends face different challenges and enemies.

Detailed information:

• Directed by: Yanagisawa Tetsuya
• Released: January 6, 2012 – March 23, 2012
• Genre: Ecchi, Harem, Supernatural, Comedy, Action, Romance
• Link to watch: https://www.hulu.com/series/high-school-dxd-4b0f2a36-db9e-4820-b39d-80b8e14f7ffc

"Saber Marionette J" is an anime series that mixes action, comedy, romance, and science fiction. It's set in the future where something mysterious happened, and all the men disappeared from the planet. So, the whole society is made up of only women. To make up for the missing men, they created advanced robots called "Marionettes" to do different jobs.

The story starts when a young guy named Otaru Mamiya finds three special Marionettes. These Marionettes are called Lime, Cherry, and Bloodberry, and each has unique skills and personalities. Otaru becomes their owner and friend, and they go on adventures together, facing various challenges.

"Saber Marionette J" is known for its mix of exciting action scenes, developing the characters, and discussing themes like how men and women relate. People liked it a lot when it came out in the late 1990s, and it even had sequels and spin-off series like "Saber Marionette J Again" and "Saber Marionette J to X" that continued the story and added more characters.

Detailed information:

• Directed by: Masami Shimoda
• Released: October 1, 1996 – March 25, 1997
• Genre: Action, Adventure, Comedy, Drama, Romance, Sci-fi, Mecha
• Link to watch: https://9animetv.to/watch/saber-marionette-j-2081?ep=25097

"High School of the Dead" is a horror anime set in modern-day Japan. The story starts when a weird and deadly disease turns people into zombies. The series primarily follows a group of high school students and their school nurse as they struggle to survive in a world overrun by the living dead.

The anime is mostly about how this group tries to stay alive, find safe places, and protect each other. They have to deal with both zombies and other people who can be dangerous. While on this journey, they run into many difficult situations and must make tough choices in a world that's gone crazy.

"High School of the Dead" is famous for its intense action scenes, bloody parts, and parts that are meant to be sexy. It mixes violent and scary moments with suggestive content, which some people might not like.

One thing to know is that "High School of the Dead" only has one season, and the manga it's based on was left unfinished because the author passed away. That means the anime has no clear ending, leaving the story incomplete.

Detailed information:

• Directed by: Tetsurō Araki
• Released: July 5, 2010 – September 20, 2010
• Genre: Fantasy, Harem, Comedy, Supernatural, Action
• Link to watch: https://www.hulu.com/series/high-school-of-the-dead-333e890d-7e4a-4227-aaf9-7a6d13faa586

"The Familiar of Zero" is a fantasy anime series in a magical world. It all begins with a girl named Louise learning to be a magician at Tristain Academy of Magic. She tries to do a particular magic spell to summon a magical friend, but things go wrong. However, Louise's summoning goes awry, and instead of calling a powerful and majestic familiar, she accidentally conjures a young man from Earth named Saito Hiraga.

Saito is stuck in this strange, old-fashioned world and can't return to Earth. He is also branded with a mysterious and powerful rune called the "Gandalfr," which grants him extraordinary combat abilities. Even though Saito is initially confused, he has to serve Louise because of the spell.

"The Familiar of Zero" is about Louise and Saito's adventures in this magical world called Halkeginia. They face challenges, fight supernatural battles, and try to figure out Saito's past and his unique mark. As the story progresses, more characters are introduced, including other students at the academy and their familiars, adding elements of romance and harem dynamics.

"The Familiar of Zero" has magic, romance, funny moments, and exciting adventures. It's mainly about how Louise and Saito's friendship grows, and it talks about things like magic, love, and the differences between rich and poor people in this magical world.

Detailed information:

• Directed by: Yoshiaki Iwasaki
• Released: July 3, 2006 – September 25, 2006
• Genre: Fantasy, Romance, Harem, Comedy, Magic, Adventure
• Link to watch: https://www.amazon.com/The-Familiar-of-ZERO/dp/B01MR3HDDK

"The Fruit of Grisaia" is about Yuuji Kazami, a high school student who moves to Mihama Academy, a calm and peaceful school. However, Mihama Academy is no ordinary school; it is a secluded institution for students with troubled pasts and psychological scars.

When Yuuji starts at Mihama Academy, he meets five unique and mysterious girls: Amane Suou, Makina Irisu, Sachi Komine, Michiru Matsushima, and Yumiko Sakaki. The story follows each girl's past troubles, their emotional struggles, and her growing relationship with Yuuji. As the story unfolds, secrets about Yuuji's mysterious background and role at Mihama Academy are revealed.

"The Fruit of Grisaia" mixes drama, romance, and thrilling parts. It explores the dark things that happened to the characters before and how they try to improve while dealing with challenging feelings and relationships. There are also funny and happy moments in the series.

"The Fruit of Grisaia" is based on a more extensive series of stories and games, and the anime mainly focuses on the stories of these girls and their relationships with Yuuji. Some more parts and adaptations continue the story, like "The Labyrinth of Grisaia" and "The Eden of Grisaia," which tell you more about what happens to the characters.

Detailed information:

• Directed by: Tensho
• Released: October 5, 2014 – December 28, 2014
• Genre: Drama, Psychological, Romance, Harem, Thriller
• Link to watch: https://www.primevideo.com/detail/The-Fruit-of-Grisaia/0P0UCSE93ZKC7KE3HTBEMOGKEY

"Date A Live" is classified as an action harem anime. It combines elements of action, romance, and harem in its storyline. The series revolves around the male protagonist, Shido Itsuka, who can seal the powers of Spirits - powerful beings that threaten to cause catastrophic events.

"Date A Live" is set in a world where destructive beings called "Spirits" periodically descend upon Earth, causing massive chaos and destruction. To combat this threat, an organization known as "Ratatoskr" enlists the help of a high school student named Shido Itsuka, who possesses a unique ability. Shido's power allows him to seal the Spirits' powers by making them fall in love with him, effectively preventing further disasters.

The series is known for its mix of action-packed battles, harem elements, and romantic development between Shido and the various Spirit girls. It explores themes of love, acceptance, and the consequences of Shido's unique ability. "Date A Live" has multiple seasons, expanding on the story and character relationships.

Detailed information:

• Directed by: Keitaro Motonaga and Jun Nakagawa
• Released: April 6, 2013 – present
• Genre: Action, Harem, Romance, Supernatural, Sci-Fi
  
• Link to watch: https://www.amazon.com/gp/video/detail/0TZXM9YYBXGZCIF2K88JTG70NS/ref=atv_dl_rdr?tag=thvo0f-20

"Rosario + Vampire" is an action harem anime series based on a comic book by Akihisa Ikeda with the same name. The story is about a high school student named Tsukune Aono. He didn't do well in school, so he went to Yokai Academy, a school for monsters and magical creatures. This school is a secret hidden from regular humans, and Tsukune initially didn't know its true nature.

When Tsukune got to Yokai Academy, he met Moka Akashiya, a pretty vampire girl who uses a unique necklace to hide her vampire side. Moka became Tsukune's first friend and eventually told him her secret. Tsukune discovered a world with magical creatures like witches, succubi, and werewolves, all going to the same school.

As Tsukune starts his new life at Yokai Academy, he makes friends with other monster girls with special powers and quirks. Along the way, Tsukune faces challenges and dangers from magical creatures and human groups wanting to reveal or destroy Yokai Academy.

"Rosario + Vampire" mixes romance, comedy, and action and often has funny and racy situations. It's about friendship, fitting in, and accepting others in a diverse and sometimes strange community of magical beings.

Detailed information:

• Directed by: Takayuki Inagaki
• Released: January 3, 2008 – March 27, 2008
• Genre: Harem, Supernatural, Comedy, Romance, Ecchi, Action
  
• Link to watch: https://www.netflix.com/vn-en/title/70230165

"Campione!" is a fantasy anime about a high school student named Godou Kusanagi. His life changes dramatically when he accidentally kills an ancient god named Verethragna in Italy. This accident gives him the god's powers and duties, making him a Campione who protects humanity from supernatural threats.

In the story, Godou has close relationships with some female characters. Initially, Erica Blandelli and Liliana Kranjcar help him with supernatural problems, but they also develop romantic feelings for him. This creates a love triangle and adds a romantic aspect to the series.

The anime combines mythology and supernatural elements from different cultures and legends. Godou battles gods, demons, and other mythical creatures, exploring the rich history of these myths. The show has well-animated action scenes with intense fights between Godou and these supernatural beings.

"Campione!" is a mix of action, romance, and supernatural mysteries in a fantasy world filled with gods and legendary creatures. It also includes elements of a harem, where multiple girls have romantic feelings for the main character. The series explores what it means to be a god-slayer and the challenges that come with it in a world where myths come to life.

Detailed information:

• Directed by: Keizō Kusakawa
• Released: July 6, 2012 – September 28, 2012
• Genre: Action, Harem, Fantasy, Romance, Supernatural
• Link to watch: https://watch.plex.tv/show/campione/season/1

"Freezing" is a sci-fi action anime set in a world where humanity is constantly threatened by extraterrestrial creatures known as Nova. There are unique female warriors called Pandoras and their male partners called Limiters to fight these aliens. They get training to battle the Nova.

The story is about Kazuya Aoi, a young guy who becomes a Limiter and goes to a school called West Genetics Academy, where Pandoras and Limiters are trained. There, he meets Satellizer el Bridget, a skilled Pandora who doesn't want a Limiter. But Kazuya partners with her, working together to fight the Nova.

"Freezing" is about the relationships between Pandoras and Limiters and their battles against the Nova. These fights need teamwork and strategies. The anime also explores the personal problems and pasts of the characters.

The anime has some sexy and suggestive parts, with characters wearing revealing outfits and scenes that imply romantic stuff. This is a big part of the show. "Freezing" also talks about themes like competition, making up for mistakes, and how characters change and grow as they deal with their fears and problems.

Detailed information:

• Directed by: Takashi Watanabe
• Released: January 8, 2011 – April 7, 2011
• Genre: Action, Sci-Fi, Harem, Drama, Romance, Ecchi
• Link to watch: https://www.amazon.com/Freezing-Season-1/dp/B00ENQ56QK

"Demon King Daimao" is an action harem anime with a mix of magic and technology in its world. The story is about a guy named Akuto Sai who goes to a school called the Constant Magic Academy to become a high priest. But things get tricky when he gets a prediction from a magical bird saying he'll become the Demon King, who's supposed to cause chaos.

Despite Akuto's good intentions, everyone at the academy fears him because of this prophecy. They think he's a bad guy. Akuto tries hard to prove that he's not going to become the Demon King, and he makes friends with different students at the academy, even though they are initially afraid of him. The anime talks about destiny, choice, and what happens when you do things.

"Demon King Daimao" mixes fantasy, comedy, action, and harem dynamics. It shows funny moments, magical fights, and Akuto's romantic connections with the girls who like him. The anime balances between light and profound moments as the story goes on.

Detailed information:

• Directed by: Takashi Watanabe
• Released: April 2, 2010 – June 18, 2010
• Genre: Fantasy, Harem, Comedy, Supernatural, Action
• Link to watch: https://www.crunchyroll.com/series/GRGG58V1R/demon-king-daimao