Rio and Yakumo are members of the idol group KEy, formed through an audition program. One day, while wishing to become closer to the cool Yakumo, an unexpected kiss completely changes their relationship! It turns out Yakumo was actually a super-devoted fan, absolutely obsessed and in love with Rio! Since confessing his feelings, Yakumo's romantic and lustful desires have only escalated. Seeing the special side he only shows him, Rio begins to waver between friendship and love...