When UA student Yui Kugisaki feigns interest in a Shiketsu High boy, she accidentally triggers a fierce, territorial rivalry between her two best friends, Bakugou and Kirishima, forcing them to confront their true feelings for her.
Yui Bakugou, Katsuki's slightly younger sister with white hair and enhanced abilities, attends Shiketsu High to avoid her brother's yelling, but their paths collide at a joint sports festival where she meets his UA classmates.
