Hyouka: Motsubeki Mono wa

Houtarou Oreki expects to spend the summer conserving energy, but his sister leaves him with a lifeguard job at a local pool. There he runs into Eru Chitanda, Satoshi Fukube, and Mayaka Ibara, turning an unwanted shift into an afternoon with the Classics Club.

When Chitanda realizes that a small white object she noticed on a woman's ear has vanished, her curiosity immediately takes over. With only a few ordinary clues around the crowded pool, Oreki is once again drawn into solving a tiny mystery hidden inside an otherwise uneventful day.