The Nurse serves at the school where the main characters study. She treats Fujino Shion after Fujino collapses following intense sexual activity with Fukaya Mamoru in a restroom, overseeing Fujino's recovery in her office.

When Fukaya Mamoru later confronts the Nurse in a hallway, inquiring about Fujino's heightened sexual behavior, the Nurse reminds him she last observed him with classmate Mita Yuki.

Her personal history includes a past romantic affair with a teacher during her own student years. This resurfaces when that same teacher—who once broke her heart—returns to the school. In her office, she privately reflects on their affair while masturbating.

After Fukaya Mamoru sustains a head injury causing amnesia, he mistakes the Nurse for his girlfriend. He enters her office and engages in non-consensual sex with her. She corrects his misconception and retaliates with physical violence. Fujino Shion witnesses this altercation.

The returned teacher exploits the Nurse's emotional past by offering Mita Yuki a love potion in exchange for sexual favors.