Zeikin de Katta Hon

Ishidaira is a known delinquent who steps into a public library for the first time since his elementary school days. What begins as a simple visit quickly takes an unexpected turn when he is confronted by Hayasameru and Shirai, two staff members working at the facility. They inform him that he still has an overdue book in his possession—a volume he originally borrowed a full decade ago and never returned. Caught off guard by this long-forgotten debt, Ishidaira finds his original plans completely derailed. Instead of merely checking out a new book and leaving as he intended, the circumstances surrounding his overdue item pull him deeper into the library's daily operations. This manga follows his surprising journey from a reluctant visitor attempting to borrow reading material to someone who ultimately ends up working behind the counter himself, navigating an environment far removed from his usual lifestyle.