- Adam Gibbs as Hotaru Oreki
- Madeleine Morris as Eru Chitanda
- Dallas Reid as Satsohi Fukabe
- Jill Harris as Mayaka Ibara
- Caitlin Glass as Tomoe Oreki
- Linda Young as Ms. Itoigawa
- Alexis Tipton as Fuyumi Irisu
- Sarah Wiedenheft as Sawakiguchi
- Brina Palencia as Kochi
- Dave Trosko as Tanabe
- Dawn M. Bennett as Yuasa
Funimation will release the entire 22-episode series and an OVA for the anime. The first part will ship on home video on July 4 and will include episodes 1-11 plus episode 11.5.Kyoto Animation's 22-episode television anime premiered in 2012. Yasuhiro Takemoto (Amagi Brilliant Park, Miss Kobayashi's Dragon Maid, Full Metal Panic? Fumoffu) directed the anime, Shoji Gatoh (Full Metal Panic!) handled series composition, Futoshi Nishiya (Free! - Iwatobi Swim Club, A Silent Voice) designed the characters, and Kōhei Tanaka (Onihei, The Laughing Salesman) composed the music.
The story follows a boy named Hōtarō who is not assertive about getting involved, but was ordered by his older sister to join the classic literature club. In the club, he gets close to the truth about an incident, involving a female member's uncle, which happened 33 years ago. The "energy-saving" boy is joined by an inquisitive girl in this adolescent mystery.
The anime has not previously been released in North America.
Honobu Yonezawa's original mystery novel from 2001 also inspired a manga adaptation in Kadokawa's Monthly Shōnen Ace magazine. A live-action film adaptation starring Kento Yamazaki and Alice Hirose will open in Japan