Futaro agrees to tutor five twins who hate studying. His job is to ensure that the quintet graduates without a hitch, but first of all, he must establish a good relationship with each of them. Thus, at the end of a challenge involving generals from the Sengoku period, he wins Miku's trust. As soon as he has taken this first step, however, the boy finds himself involved in a clash with the second-born Nino, who has just come out of the bathroom, thus risking ruining his efforts...