so_low – Episode 4 (PV)

The study camp is nearing its end, and Mito Ki has strategically chosen the library as their study location, hoping the quiet public setting will curb Kōdai's outrageous demands. Her plan fails spectacularly. In the silent self-study area, where only the faint sound of writing can be heard, Kōdai insists on punishing every mistake Mito Ki makes—regardless of their surroundings. Behind the bookshelves, Mito Ki must suppress her voice as Kōdai's hands wander. He unbuttons her uniform, exposing her breasts, and shamelessly gropes her. When his hand ventures lower, her desperate resistance proves futile. Attempting to find a reference book, Mito Ki stretches for a high shelf, only to be lifted from behind and thrust into a compromising position. Her friend, peering from the opposite side of the bookshelf, locks eyes with her in a moment of devastating embarrassment. The discipline escalates with exhibitionist punishments, intense positions, and a final test match that leaves Mito Ki utterly spent. Her shame, fury, and resistance only fuel Kōdai's relentless training. This is the grand finale of the study camp—a "shameless yet cute" culmination that pushes the cheeky little sister to her absolute limits.