During the winter in Toyama in 1962, Tatsuo Mizushima is fretting about his feelings for his classmate Eiko Tsujisawa while agonizing about his upcoming high school examinations. When he was little, he and Eiko had heard that in April of a year when the winter has been very harsh, any couple finding fireflies together needs to get married. However, his family's situation does not allow Tatsuo to continue his worrying about such things for very much longer.
| Actor | Role |
|---|---|
 Rentaro MikuniNot listed | Not listed |
 Yukiyo ToakeNot listed | Not listed |
| TTamae SawadaNot listed | Not listed |
 Takayuki SakazumeTakio Mizushima | Takio Mizushima |
 Takuzō KawataniNot listed | Not listed |
 Ken TeraizumiNot listed | Not listed |
 Chōichirō KawarasakiNot listed | Not listed |
 Taiji TonoyamaNot listed | Not listed |
 Hideji ŌtakiNot listed | Not listed |
 Tomoko NaraokaNot listed | Not listed |