Tsukioka Natsu, who works in a Tokyo printing company, has a lover, Momose Yayoi, who works in a cosmetics company.Although the two are ordinary, they live a happy life every day.One day, while discussing summer vacation arrangements in Xia Tian's apartment, a call came from Xia Tian's cell phone.Xia's expression was stiff when she answered the phone.

The next morning, Xia returned to her hometown.Regarding the sudden visit, their father Kazuya, mother Sachiko, and brother Yamato, who were having breakfast, were thinking about what would happen, but they sensed the cause of the matter from the summer atmosphere where they didn't say much.Xia Tian took out the mourning clothes in his room, and Kazuya handed him the black tie.

Xia came to the mourning hall and stopped in front of the signboard that read "Funeral Cemetery of the Late Nanyun Shui Jiyi“".My friend from college, Junki Mayama, asked ”how long has it been since they last met?%'s voice.Answered in the summer after 8 years.The dead Shui Ji was Xia's former lover when she was in college.

While Xia was in the incense-burning procession, greeting Shui Ji's mother Zhu Yin and father Xiang Ping and their relatives, his eyes stayed on the girl together.Xia was shocked to know that the girl was Shui Ji's child.

Xia walked into the funeral parlor hall, and the girl just now and Tsuno Haruaki walked out of the venue.Xia Tian chats with girls.The girl called herself Hai and told Xia that she was 6 years old.Summer, reminiscing about the memories of the water season...