After losing his career and girlfriend to heart disease, company employee Masahito Onigiku had decided that he would never create anything precious again. However, one day, he meets a high school girl, Rinko Shirato, who suddenly confesses to him, “Please go out with me!"

Onigiku gradually finds hope for his life in Rinko, who is unfazed by the many times he has turned down her confession, and who is always so innocent and healthy. Then, during their annual tea party, Onigiku has a seizure. Onigiku tells Rinko, who is worried, that she is ill for the first time...?!