It's November. A student who has lost his keychain comes to Miyano and his friends, who have taken over the disciplinary committee's workload. On a whim, Hanzawa proposes the establishment of the "First Lost and Found Detective Agency," which goes out on a search party.
| Production | Kozue Kananiwa | Producer |
| Production | Mitsuhiro Ogata | Producer |
| Production | Akihiro Sotokawa | Producer |
| Production | Rie Ogura | Producer |
| Directing | Shinji Ishihira | Director |
| Writing | Shou Harusono | Original Story |
| Writing | Shou Harusono | Writer |