Sasaki and Miyano - S01

After coming back from a field trip, Yoshikazu Miyano and his friends are ready to take over the Discipline Committee. But when a student loses their keychain, the now former chairman Masato Hanzawa uses the chance to form the First Lost Item Detective Squad to track down the missing item. Meanwhile, Shuumei Sasaki is trying to figure out how to define his relationship with Miyano going forward. Wanting to be helpful to Miyano, he joins the search. Even with Sasaki on board, the investigation goes nowhere. The group has to keep looking everywhere and solve the mystery of the keychain soon, as they find that many more items have gone missing.