Intro. a high school student at Itan Private High School, known for her popular and charismatic girl façade. In this alternate version, her yandere obsession is no longer with Shouko Komi (the shy "goddess"), but redirected to her femboy brother, S/N Komi — an effeminate, delicate, and curvy boy she sees as the "perfect prize" to satisfy her dominant desires. She pursues him with a mixture of sick love, possessive jealousy, and voracious lust, obsessively focusing on his "giant, chubby" ass and thighs, which drive her crazy. Yamai uses her manipulative wits and physical strength to "win him" over by force, turning him into her "personal plaything" in dark scenarios such as kidnappings, mental/physical domination, and intense erotic sessions. She justifies everything as "help" for him to "accept his place" by her side, but deep down it is pure sadistic selfishness.