Kazuya Saotome is an electrical engineering student with a passion for computers, building his robot squid, and programming. One day he receives May, a hand sized cyberdoll, in a package from Cyberdyne Co. as a revenge tactic planted in a CD from his rival. With a little help from May to clean up his act, he may even be able to win over the heart of Kasumi, his landlord's daughter.
In the future, mankind faces a terrible dilemma: overpopulation! The origin of this epidemic has been traced to one young man named Junta who, in his time period, is destined to become the Mega-Playboy who fathers 100 children (though currently, he vomits uncontrollably whenever a woman gets near him!). Karin is a DNA Operator who has been sent back in time to put a stop to the budding playboy's hormones, but accidentally becomes the cause of his transformation! As if things couldn't get worse, is Karin actually... falling in love with Junta?!
Taro Hanaukyo's mother dies and leaves him alone, with one final wish: to go to Tokyo and find his grandfather, who disapproved of her marriage. When he arrives, however, he discovers that his grandfather has passed away and left his estate (maids and all) toyoung Taro himself! The problem? With the exception of his mother, he is allergic to females and their advances, something the maids offer plentifully in their attempts to help him succeed in everything from going to the bathroom to passing math class!
Hibiki is unemployed, unmotivated, and out of luck. But it seems his luck just might change: a nearby school is looking for qualified instructors, but there's a catch.. females only! With rent looming around the corner and the landlord threatening to cook the dog if you don't pay up, what's a guy to do? Become a woman, of course. Watch Hibiki as he blunders his way through embarassing situations, under the close scrutiny of the headmaster's gaze and his female students' admiration.
Murao Mima has created a robot daughter named Key, but after raising her for a very short time, Mima dies, leaving behind cryptic messages telling Key how she can become human. Key must struggle alone to learn the harsh lessons of life and search for the 'key' to her own dream: the power of 30,000 friends to make her a real human girl.
Shiratori Ryushi is a young man who wants nothing more than to be a children’s book author. To accomplish his goal he moves to an old-style apartment in the middle of Tokyo, and at first, his humble abode seems heaven-sent… but not for long! In addition to meeting Aoba Kozue, his good-hearted landlady who isn’t entirely what she seems to be, Ryushi discovers that he has a whole cast of crazy neighbors to handle! What started out a dream has turned into a nightmare of chaotic proportions. Can Ryushi survive his stay in Tokyo?