The bud of bittersweet first love takes bloom! 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. After rejecting Haruki's love confession, Saku tells herself it was the right thing to do, but Kotono disagrees and gives her some good advice. Will Saku find her path forward with Haruki?