Based on a series of books authored by Ryuho Ookawa. Alto is going home from school, when he finds a girl who calls herself an angel.
Unfortunately the movie What Is Happiness? is not yet available on HBO Max.
| Art | Joji Unoguchi | Art Direction |
| Production | Hideaki Hatta | Producer |
| Art | Atsushi Morikawa | Background Designer |
| Visual Effects | Tatsuya Ishihara | Animation Director |
| Writing | Ryuuhou Ookawa | Novel |
| Directing | Tatsuya Ishihara | Director |
