Hanabi Yasuraoka and Mugi Awaya appear to be the ideal pair to the outside world. But in truth, they only have one thing in common: they are both in love with somebody they can't be with. Hanabi has had a crush on her childhood friend and neighbor Narumi Kanai for as long as she can remember, so she is overjoyed to learn that he is her new homeroom teacher. Narumi, on the other hand, is quickly spotted by the music instructor, Akane Minagawa, and a connection develops between them, much to Hanabi's chagrin. Akane mentored Mugi in middle school, and she has been in love with her ever since. He meets Hanabi through a fortuitous meeting in the corridor. As these two lonely individuals spend more time together, they become closer.