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Hitoshi Kobe is pretty dumb, not good at sports, and extremely unpopular. The only thing he IS good at really is creating artificial intelligence programs on his computer. His greatest work is number 30, one which very accurately simulates talking to an actual girl. One dark and stormy night, a freak lightning strike causes number Thirty to emerge from his computer screen as a real girl, and sends Hitoshi's life on a turn for the crazy.
Shun Yanahara is a pretty normal first-year high school boy. His grades are not terrific, he's not very popular with girls, and he plays soccer with his school's club. He's often felt like someone was watching him, and, strangely enough, he's right. On a far away Earth-like planet known as O-pa, there is a civilization made entirely of women. One of them, a scientist named Lib Myura, has fallen in love with Shun. She and her two colleagues have created an illegal male human robot, called a synchroid, which they intend to fill with Shun's consciousness. However, things never go exactly as planned...
Hiroki's passed his high-school entrance exams, and now he's looking forward to a peaceful, lazy spring vacation before the entrance ceremony. All of that is ruined on the morning he's woken up by Hinata, a stranger who claims to be his childhood friend. The truth is, Hinata is a "tsundere childhood friend" android made for him by his mad scientist neighbors in celebration for him passing his exam! With all the complications his new "childhood friend" is going to cause in his life, what will happen to the peaceful vacation Hiroki had hoped for?
Makabe Masamune has changed himself greatly for a single reason: he wants revenge. Contrary to his past, he has worked hard to become good-looking in order to carry out this goal. Faster than anticipated, he even meets the target of his revenge the first day after transferring in.. Adagaki Aki! He wastes no time beginning his plan, but revenge doesn't come easily.
Legend has it that males in the Seryo household are bound to be luckless when it comes to women. Masaki Seryo, a 15-year-old high school student, is a testament to this. As he hopes to leave his nagging female-dominated family behind and moves to the dorms, he falls into an even more baffling situation involving the same thing he's attempted to escape—women.
Tetsuro Tanaka is a month late starting high school due to an accident. As he's finally able to go, he's almost hit by a truck, but is saved by a mysterious girl who wears the same pendant as the one that his school has. He finds out that he's the only boy in his class and is instantly hated by his classmates except for a few. One girl is Yayoi Asuka, whose name Tetsuro is familiar with as it's the same name as a girl he knew when he was little. A few more girls get introduced, one being Sakuya Kazamatsuri. Yayoi reveals that she has superpowers and she takes him to his dorm, which she is going to share with him along with Sakuya, Miyabi Tsukuyomi, Akio Suzuka, Otome Chouno, Hifumi Inokai, and finally his teacher, Kano.