[[Старшеклассник-хулиган]] Сейджи Савамура (沢村正治) отчаянно хочет найти себе подружку, особенно после того, как его отвергло уже двадцать кандидаток. Он уже всерьёз начинает опасаться, что проведёт всю свою жизнь с правой рукой в качестве единственной подруги. Очевидно, этот факт не меняется, когда одним прекрасным утром он обнаруживает, что его правая рука превратилась в девушку по имени Мидори Касугано (春日野美鳥). Почти сразу она признаётся, что влюблена в Сейджи уже три года…

There isn't a single person in Sakuradamon High who hasn't heard the legends about Seiji "The Mad Dog" Sawamura's demonically powerful right hand. His reputation makes it fairly difficult for him to approach girls, and after being rejected 20 times straight, he half-jokingly vows to finish high school with his right hand for a girlfriend.

Much to his surprise, after waking up the next morning, Seiji discovers that his demon right hand has mysteriously turned into a miniature girl, Midori Kasugano, who reveals that she has had a crush on Seiji for the past three years. Because their situation is not ideal for either of them, Seiji attempts to return Midori to normal. But after causing a big misunderstanding at the Kasugano household, the pair decide to keep their predicament between them until a solution is found. Thus begins an odd relationship, and what could be the only chance for Midori to finally be with the one she loves.

[Written by MAL Rewrite]