Hida Kizuna possesses the HHG (Heart Hybrid Gear) ability, but it is not strong enough to make him particularly important. His older sister calls him to transfer to a strategic defense school, where many of the students (many of which are large-breasted girls) use their HHG abilities to fight invaders from another world while wearing extremely skimpy pilot outfits. Kizuna's fighting ability doesn't measure up, but his sister has another plan—apparently having erotic experiences with Kizuna will allow the girls to replenish their energy or power-up. It looks like his new school life is going to be full of embarrassment. (Source: MangaHelpers)

Takumi Tsuzuki is a high school student who attends the Umenomori Private Academy, free of charge, alongside Fumino Serizawa, a childhood friend of his whom always says the opposite of what she feels. He spends most of his time at school fending off Chise Umenomori, the granddaughter of the board chairman and a pampered princess, who is constantly roping him into her eccentric hobbies. After school, he goes to work at the Stray Cats confectionery, a cake shop run by his adoptive older sister, Otome Tsuzuki, until it's time to go to bed. This is the average routine in the day and the life of Takumi. Mayoi Neko Overrun follows another seemingly average day in the life of Takumi. With his sister away from the shop, having gone to save someone else in need of help, Fumino takes it upon herself to wake him up so that he won't be late for their usual walk to school together, giving him a glimpse of her blue and white striped panties in the process. What a nice way to start the day. When Otome returns home, she brings with her a girl named Nozomi Kiriya, whose hair and mannerisms resemble that of a large cat. It turns out that she is a runaway that Otome can't help but take in. Takumi's ordinary days are transformed into splendid chaos as he tries to unravel who this mysterious beauty is and what she's running away from...

A bus full of eccentric individuals is headed towards the urban legend known as Nanaki Village, a place where one can supposedly start over and live a perfect life. While many have different ideas of why the village cannot be found on any map, or why even the police cannot pinpoint its location, they each look forward to their new lives and just what awaits them once they reach their destination. After a few mishaps, they successfully arrive at Nanaki Village only to find it completely abandoned. Judging from the state of disrepair, it has been vacant for at least a year. However, secrets are soon revealed as some of the group begin to go missing while exploring the village and amidst the confusion, they find bloody claw marks in a forest. As mistrust and in-fighting break out, will they ever be able to figure out the truth behind this lost village?

At the turn of the millennium, Ginei Studio's dilapidated buildings are set to be demolished. Ex-employee and filmmaker Genya Tachibana decides to honor this occasion with a commemorative documentary about the company's star actress: Chiyoko Fujiwara, the reclusive sweetheart of Shouwa Era cinema. Having finally obtained permission to interview the retired starlet, an enamored Genya drags along cynical cameraman Kyouji Ida to meet her, ready to put his lifelong idol back in the spotlight once more. Hidden in this secluded mountain retreat is a thousand years of history condensed into one lifetime, waiting to be narrated. Chiyoko's recollections take them on an illusionary journey through Japanese cinematic history that transcends the boundaries of reality; the saga of her acting career intertwines with her filmography, the actors in her life blend seamlessly with the characters on screen, and the present melds with the past. Though the actress may have retired at the height of her career 30 years ago, the curtain on her life's stage has yet to fall.