In an intimate, dimly lit room, the Yamamoto twins, Mountain and Manaka, discover the forbidden fruit of incestuous desire. Manaka's slim fingers tentatively explore her twin's body, tracing the familiar landscape with a new, hungry curiosity. As she leans in, her breath hitches, and she whispers, "Mountain, is this wrong?" The question hangs heavy in the air, their dual reflections in the mirror a stark reminder of their shared blood and the taboo they're about to shatter.