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Ikusabe Takamaru is a student at the Ten Treasure Academy, living an ordinary school life, seeking romances which are constantly interfered by Shihoudou Narika (the daughter of his apartment manager). One day, he fell in love at first sight with girl, a transfer student named Takamori Haruka. Then on that very night, Takamaru and Narika became pursued by a group of mysterious ninja. Just when they thought all hope is lost, Haruka appeared in kunoichi attire. Haruka referred to Takamaru as "young boss", and ask him to do H stuff towards her. This gave her superhuman power that enables her to defeat the mysterious ninjas.
However, this is just the beginning of a very long battle.