Oreki Houtarou is an "energy-saver" kind of guy, who expends as little energy as possible to do only things he has to. When he starts high school, his older sister sends him a letter asking him to join the Classics Club. The club meant a lot to her, and its number of members has been reduced to zero. Houtarou reluctantly signs up for the club, only to find that someone else has joined, too! She's Chitanda Eru, a cute, big-eyed girl with an overwhelming sense of curiosity. A mystery crops up that catches Eru's interest, and also draws in Houtarou's friend, Fukube Satoshi. They continue solving mundane mysteries together, and soon they draw in Satoshi and Houtarou's friend, Ibara Mayaka, as well. Mayaka has had a blatant crush on Satoshi since middle school, but he always fends off her advances. Together, they search for the truth in a mystery that involves the history of the Classics Club.

From Crunchyroll: Kobato decides to become an honest, humble citizen after enduring a bitter experience known as “wisdom work.” He forms a pact with Osanai, his classmate with the same goal, and they plan to enter high school leading quiet lives. But for some reason, inexplicable events and disasters keep happening around them. Will Kobato and Osanai ever manage to live ordinary, peaceful lives?

Oreki Houtarou is a self-proclaimed "energy-saver" - that is, he will not actively waste energy doing things that aren't necessary. Though he had no interest whatsoever in joining any clubs upon entering Kamiyama High School, he was commanded by his older sister Tomoe to enter the school's Classics Club, which was in danger of getting abolished as all previous members have graduated. Together with his old friends Fukube Satoshi and Ibara Mayaka, as well as the elegantly ladylike and curiously inquisitive Chitanda Eru, the newly reformed Classics Club find themselves involved in all sorts of mystery-solving escapades. Houtarou soon finds out that the Classics Club, as Tomoe has promised, is actually "quite interesting". *Note: Book one of the Koten-bu Series.*

Kobato-kun and Kosanai-san are now in their second year of high school. The two hide their true natures as "fox" and "wolf," and try to act like ordinary small-time citizens, but this summer, there is something sinister in the air...? (Source: Square-Enix, translated) *Note: Second entry in the Shoushimin Series.*

Kobato Jougorou is a boy who wants to overcome his habit of deductive reasoning and over-analyzing everything; Osanai Yuki is a girl who is avoided by others because of her strange tendencies. Both of them desire nothing more than to have a simple and peaceful high school life. This is a story about two people who are aiming and working together to be inconspicuous citizens. (Source: jCafe24)

Kobato is a high school freshman who wants to live a normal life, not become a great detective. He tries to lead a quiet and modest school life with his like-minded friend, Osanai, but one mystery after another keeps coming his way. Even though he doesn't want to stand out, Kobato is compelled to solve mysteries. Will he ever find peace? (Source: Magazine Pocket, translated)

The winter of 1578, four years prior to the Honno–ji Incident. Araki Murashige has betrayed his ally Oda Nobunaga and holed himself up in Arioka Castle—but a string of unsettling incidents within the castle walls has him at his wit’s end. The desperate warlord’s only hope for solving these mysteries is imprisoned in the castle’s dungeon: a man named Kuroda Kanbei, one of Oda’s most gifted strategists. When all the conflict and intrigue come to a close, what will these two men have gained…and lost? Award–winning author Honobu Yonezawa’s English–language debut is a page–turning blend of historical and detective fiction. *Source: Yen Press*

*Note: Book six of the Koten-bu Series.*

*Note: Book three of the Koten-bu Series.*

*Note: Book four of the Koten-bu Series.*

*Note: Book five of the Koten-bu Series.*