Kisara Hanae, a girl who retired from karate due to an accidental injury and was at the bottom of her life, meets Ashida Haruki, the songwriter of a song she used to listen to before every match. But he is now a failed musician, a one-hit wonder, and a weirdo with a lot of problems! Hanae's childhood friend, Natsukawa Shingo, who is always watching over her gets involved and a love triangle develops. Hanae has a "secret" that she can't tell anyone, and decides that "this is the last love of her life".