Hanabi and Mugi seem like the perfect couple, but in reality, their hearts belong to someone else: Hanabi is head over heels for her homeroom teacher, who she’s known ever since she was little, while Mugi has the hots for his former tutor. No one knows they’re only dating to share their grief and soothe their own loneliness. Yet how much longer can they keep up the charade when the targets of their affections start getting closer to each other?