Kokoro has no time to ponder her professional purgatory when she finds herself the mentor to a taciturn girl named Hikari Inoue bearing a Librarian Association commission as a special-case librarian just like herself. While Iina and Aruto speculate on Hikari's perspective of her new surroundings, Kokoro takes it upon herself to warmly welcome her protege with some brewed tea; even with a custom-designed librarian uniform demonstrating Iina's goodwill, Hikari is too wracked with anxiety over her mom's medical status to acknowledge that labor is expected of her at Kokoro Library...