佐々木と宮野 恋に気づく前のちょっとした話。

Before Shuumei Sasaki works out how he really feels about his classmate Yoshikazu Miyano, the two end up forming an impromptu detective squad with the school's Discipline Committee to track down a missing keychain. Miyano takes over the committee after a class trip, and Sasaki is drawn into the search, increasingly unsure what to make of his own growing interest in Miyano. This unaired OVA prequel was bundled with the ninth volume of the Sasaki to Miyano manga.