Onachu!

Marimo, a young woman with an insatiable appetite for self-pleasure, finds solace in the secluded corners of her school's restroom. Unbeknownst to her, the thrill of potentially being caught only adds to her excitement, causing her to indulge in the carnal act of self-gratification. Her voice, filled with lust, echoes through the empty space as she surrenders to her desires. However, little does she know that her love for self-pleasure will soon lead her down a path of unexpected and sexually charged encounters. [Translated from Getchu]