
Overview:
Was bundled with the third volume of the manga.
It's another regular day, with Houtarou Oreki sitting at home as usual; that is until his sister Tomoe ropes him into working as a lifeguard at the local swimming pool. Upon reaching the pool, Oreki coincidentally meets the other members of the Classics Club. Eru Chitanda notices that a white object that was on a woman's ear a while ago suddenly disappeared, which leaves her curious about the mystery behind it.
Hyouka: Motsubeki Mono wa features Oreki and the rest of the Classics Club as they have fun at the pool and solve the mystery that has piqued Chitanda's curiosity.
(Source: MAL Rewrite)
Characters and Voice Actors

Tomoe Oreki
SUPPORTINGSatsuki Yukino
Japanese

Satoshi Fukube
MAINDaisuke Sakaguchi
Japanese

Houtarou Oreki
MAINYuuichi Nakamura
Japanese

Eru Chitanda
MAINSatomi Satou
Japanese

Mayaka Ibara
MAINAi Kayano
Japanese

Shouko Yuasa
SUPPORTINGAnn Vielhaben
German