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Synopsis

After returning from a field trip, Yoshikazu Miyano and his classmates prepare to assume roles on the Discipline Committee. When a student misplaces a keychain, former chairman Masato Hanzawa seizes the moment to assemble the First Lost Item Detective Squad to locate the missing accessory. Shuumei Sasaki, who is uncertain how to define his relationship with Miyano, joins the effort to support him. Despite Sasaki’s involvement, the team’s initial attempts fail, and their search widens as they realize other belongings have also vanished. The group must continue investigating every lead to recover the keychain and address the growing pattern of disappearances.