High school student Hanabi Yasuraoka has been in love with Narumi Kanai, her older childhood friend who is now her homeroom teacher. But Narumi is in love with the new music teacher Akane Minagawa. Mugi Awaya, another student, is also in love with Akane, who was his tutor when he was in middle school. Hanabi and Mugi make a pact and begin a fake relationship to satisfy each other's loneliness from their respective unrequited loves. They agree to not fall in love with each other and end the relationship if their love is returned from the people they are in love with.