Disowned and deemed useless by her family, Mimi Hirogori is a teasing mischievous girl whose only care and importance in the world lie with her beloved eldest sister. However, what Mimi didn't expect was the sudden occurrence of her sister's death.
Alone with no one to support her, Mimi decides to step up her game and prove herself towards her deceased sister. In order to do all this while seeking revenge the young girl...disguises herself as a man?!