She loves bananas! The aho-girl, Hanabatake Yoshiko, who doesn’t care if she can’t do her studies at all, starts yet another day at school. Her carefree actions of idiocy seems to not only cause trouble for her childhood friend, A-kun, but her classmate, Sumino Sayaka, as well.

Yoshiko, self-proclaimed "master player," goes to the park. She immediately starts playing with the kids, but the kids can't help but show surprise and confusion at the games her idiot whims bring her to play. Kurosaki, a delinquent, joins the mix, and the disciplinary committee president who can't keep her fantasies in check control appears. More idiots just keep coming!

Sayaka visits the Hanabatake house! But awaiting her there was none other than Yoshiko's mother, Yoshie. Fearing that Akuru might be stolen away by Sayaka, she does what she can to embarrass Sayaka. Yoshiko joins the mix, and what does Sayaka do?