Izuru Nikki, a childhood companion of Rikka Ichinohe, habitually asserts authority over their interactions, with Rikka complying despite sporadic resistance. At a school cultural festival, their class performs a play casting Izuru as a prince and Rikka as his princess. Though the scene dictated a scripted kiss, Izuru diverged from the plan, pressing his lips to hers in an unscripted moment. This act defies expectations and sparks an irreversible change in their bond, shifting its trajectory into uncharted territory.