An otaku manicurist, an ordinary office lady, a doctor with no love life, and a 30-something still obsessed with an indie idol group all meet through a matchmaking site.
Unfortunately the movie Happy Mail is not yet available on HBO Max.
| Editing | Haruo Inoue | Editor |
| Production | Osamu Iwamura | Producer |
| Writing | Yuki Odo | Writer |
| Camera | Sumio Ogi | Director of Photography |
| Sound | Junichi Matsumoto | Original Music Composer |
| Writing | Erika Misawa | Writer |
| Directing | Haruo Inoue | Director |
| Production | Seijiro Kaneko | Producer |
