Years prior, Haruto Kirishima befriends Yuzuki Eba and asks her to return to his hometown, Shōbara, Hiroshima, if she is ever troubled. In the present, Yuzuki transfers to Shōbara due to her estrangement with her step-family. She helps Haruto develop a friendship with Nanami Kanzaki, but Haruto ultimately falls in love with Yuzuki. He helps Yuzuki reconcile with her family which encourages her to return to Tokyo. The two begin a long-distance relationship until Yuzuki suddenly cuts all ties with him. Haruto transfers to Tokyo and learns Yuzuki has begun dating Kyousuke Kazama out of sympathy for his terminal illness. In response, Haruto declares he will take Yuzuki back prompting Kyousuke to take a risky surgery in order to compete for Yuzuki’s love fairly. Following Kyousuke’s death, Haruto and Yuzuki stop seeing each other out of guilt.
Two years later, Haruto has been dating Asuka Mishima. When he reunites with Yuzuki, the two realize they still love each other. Haruto ends his relationship with Asuka in order to be with Yuzuki which causes their friends to ostracize them. When Yuzuki’s father objects to their relationship and attempts to relocate her, she begins living with Haruto; the two eventually earn her father’s approval. After reconciling with their friends and graduating from university, Haruto takes a job that relocates him to Kōchi. Unable to sustain their relationship, the two break up; two years later, Haruto is transferred back to Tokyo and reunites with Yuzuki, who had been waiting for his return. The two are married shortly after.