The bud of bittersweet first love takes bloom!

A mysterious boy comes to Saku Fujigayas rescue when she falls ill on a train, but he leaves before she can thank him. After this experience, Saku never ignores strangers in need of help to emulate the boy who helped her.

Now that Saku realizes shes in love with Haruki, she finds her heart racing for a new reason every dayuntil Haruki and Kotono start pretending to be a couple to protect Kotono from her ex-boyfriend. Then the blunt-speaking Iryu gets involved in Sakus life, causing even more trouble!