When elder brother Youta and kid sister Hikaru get into an accident that switches their bodies, Hikaru (in her brother's body) changes into a fiendish sadist, and Youta (in his sister's body) finds himself her "girlfriend." Thrust into a bizarre reality where he's now taking orders from his own body[...]

ikaru is pressuring Youta to take their relationship too far and too fast for her brother, who still can't see Hikaru as anything but a little sister. But Hikaru is not willing to take "no" for an answer. As tensions escalate between the siblings-turned-lovers, onlookers Oda and Mayama can't help bu[...]