Tomohiro takes his fiance Machiko to his hometown of Aridagawa in Wakayama Prefecture to see his family.Tomohiro’s family includes three siblings. His younger brother Takeshi refuses to go to school. His older sister Yumi isn't interested in their family. Younger sister Sayaka has an inferiority complex and has a fear of dating. There's also Satomi who everybody calls Mama and she does all of the housework. Kayoko is called Kaka and she works as a snack bar manager. Narumi is called Haha and she is a high school teacher. Finally, there's their father Shoichiro better known as Chichi. It's an unusual family, but able to exist in harmony. Due to Machiko's appearance, the family becomes shaken.

Kazuho Anamori, a high school girl, was unable to fit in with her class because she was reluctant to withdraw. One day, by chance, she met Miko Karakida, who was born with heart disease, and they became closer. However, six months later, the shrine maiden died while in the hospital. A letter arrives at Ichiho who is sad. "I have a story about Miko Karakida. Come to that room tomorrow night.” What is the story about the shrine maiden? Ichiho goes into the school building at night. A mysterious transfer student, Rin Ukima, who appeared at the same time as the death of the shrine maiden, was waiting there.