Amiri and Sumire were childhood friends. However, after being estranged, when they reunited at the same school, Amiri had become a delinquent gal who was rumored to be involved with half-girlfriends and do drugs. Meanwhile, Sumire starts dating a boy, but soon Amiri starts bullying him. In fact, the reason why Amiri distanced herself from Sumire and strayed from her path was to give up on her unfulfilled feelings for Sumire. Amiri can't stand Sumire repeatedly blaming herself to protect her boyfriend, and tries to mess everything up with her back-channel aphrodisiac.