Desperate to get her hands on a gown she saw on her way home from school, Hina jumps into "Aoiro Toshokan" for a part-time work. There, she ends up working under the Library Director who is also an author known as Shimokomoriya. Thus begins Hina's boring days with the handful Sensei.

Also included is a one-shot titled "2-nen H-gumi Gakkou no Susume".