A mysterious boy comes to Saku Fujigaya's 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 knows Kotono might like Haruki too, she doesn't know what to do. Distressed, Saku is embraced by Iryu, who helps hide her from prying eyes. Saku discovers that Iryu's cold, blunt manner conceals surprising kindness, and she gradually begins to warm to him...