In a country where all races of human and creature live together, love is blossoming as people don't worry about each other's quirks or appearances. Among them is a clumsy dullahan who's head over heels about her track star ***friend, a confused *** who questions how to talk to his mermaid crush, and a cute centaur wondering how to confess to her ch*ldhood friend.

Everyone seems to be catching the love bug except for Setsuka, an icy oni who usually gives humans the cold shoulder. That changes when a determined, kind classmate named Eiji confesses his love to her, lighting a small spark in her chest. With advice from her monstrous friends and equally lovestruck sister, Setsuka's cold heart might turn red hot soon enough!