Centers on Oreki Hotaru and his life in the classic literature club.His mundane world is flipped upside down as they begin to solve various mysteries.
A high school boy Houtarou Oreki has no energy, and always wants to be efficient in his life. His sister Tomoe offered him to join the Classic Literature Club that faced the prospect of disbandment due to no members.
Eru grows bored of the club's lack of activities and suggests that they prepare an anthology to submit for the school's culture festival in the fall.
Over coffee, Eru opens up to Oreki to explain why she joined the club and asks him for his help with a personal matter.
Eru decides to solicit Satoshi and Mayaka's help hypothesizing what happened to her uncle.
Houtarou is torn between continuing with his "gray" life and the "rosy" life that the others live.
Houtarou's history class is interrupted by an outburst coming from Eru's math class, prompting a discussion in the Classic Literature Club about the nature of the seven deadly sins, and what might provoke Eru to become angry.
During summer vacation, the Classic Literature Club members take a trip into the mountains to stay at a hot springs resort inn run by Mayaka's relatives.
One of Eru's acquaintances invites the Classic Literature Club to a screening of a student film made by the members of Class 2-F so they can offer their opinions
In search of a conclusion to their movie, the assistant director, the prop master, and the publicist meet with the Classic Literature Club members one at a time to propose their solutions to the unfinished murder mystery.
Irisu asks Houtarou again that he infers the conclusion of their movie Hongo thought from her notes or the scenes which they have already taken.
Mayaka, Satoshi and Eru criticize Houtarou for ignoring Hongo's feelings. Why didn't Irie ask Hongo for the story through Eba? --- He just realizes what Irisu really wanted him to do.
It is the first day of the school culture festival, and the club members look forward to it with both longing and dread.
Satoshi tries to use the Quiz Club's quiz show event to promote the Classic Literature Club. Eru goes around beating the bushes for ways to help sell all of the copies of "Hyouka."
The Classic Literature Club cooking team competes against three other teams in the Cooking Club's timed "Wild Fire" competition. However, Mayaka is delayed drawing posters for the Manga Club
When the members of the Classic Literature Club talk about the happenings in the festival, they find the theft cases are occurred by Jumonji consecutively.
Satoshi is ready for Jumoji to strike, but when the anticipated target is passed over, he must reconsider his strategy.
The members of the Classic Literature Club get a lot of students in the club room to catch the thief. The club magazine "Hyouka No.46" sells like wildfire because of that.
A helicopter in the sky reminds Houtarou of the teacher Ogi of his junior high school days.
Houtarou tells Eru that he can come up with a plausible explanation for any situation she can think of, so when a seemingly mundane schoolwide announcement is made, she challenges him to figure out the reason behind the announcement.
At New Year's, Eru invites Houtarou to join her in paying her family's respects at the town shrine.
Japanese people have a custom that girls confess their own love to the boys with a chocolate on Valentine's Day.
Houtarou is enlisted by Eru to appear in a Dolls' Festival parade that her local shrine holds every year.
Houtarou's sister returns home and sets her lethargic brother up with a temporary job filling in as a lifeguard at the city pool. Satoshi invites Eru and Mayaka out to see Houtarou at work and the group stumble upon a minor mystery to be solved.
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