Library

Oreki Houtaro participated in the local traditional festival "Hina Doll Festival" at the request of Chitanda Eru, a member of the Ancient Books Research Society. The content of this festival is that "living dolls" wearing twelve singles parade in the street, but this year due to a communication error, it is unclear whether it can be held. In the end, thanks to Chitanda's idea, the festival was successfully held. However, she was curious about the "mistake" and decided to work with Houtarou to deduce the truth.

Spring has arrived, Houtaro and others have entered the second year of high school. At the same time, the "Ancient Book Research Club" where they belong also welcomes a new student who joins temporarily-Ohinata Tomoko. Ohinata Tomoko quickly became familiar with Chitanda Eru and the others, but one day, she left an incomprehensible word and told them that she would not join the club. The reason seemed to be the conversation between her and Chitanda in the activity room, but Houtarou disagreed. With her character, it is impossible for her to harm others. During the marathon held on the day of the deadline for joining the company, Houtarou speculated on the truth behind Ohinata's change of heart while running!

A choir festival is about to be held in Kamiyama City, but Airu Chitanda, who was in charge of solo singing before the performance, is missing. Houtaro Oreki found clues from Airi's state before the summer vacation, the investigation and testimony of Mayaka Ihara and Satoshi Fukube, the competition songs, and someone's lies, and went to find Airi alone. Where is Airu, and what are her real thoughts?