Moshimo, Japan. The annual fireworks festival is about to take place and a group of schoolboys, arguing over whether they are round or flat when viewed from different angles, set out to find it out.

Suzu Hiroseas Nazuna Oikawa (voice)
Masaki Sudaas Norimichi Shimada (voice)
Mamoru Miyanoas Yūsuke Azumi (voice)
Shintaro Asanumaas Jun'ichi (voice)
Toshiyuki Toyonagaas Kazuhiro (voice)
Yuki Kajias Minoru (voice)
Shin-ichiro Mikias Nazuna's Mother's Fiancé (voice)
Kana Hanazawaas Teacher Miura (voice)
Takahiro Sakuraias Teacher Mitsuishi (voice)
Michiko Neyaas Norimichi's Mother (voice)