During a nocturnal study session, Midori bravely confesses her affection to her reserved classmate Sora, using the master keys she swiped as a bold invitation. Her forwardness charms him, leading to a night where their academic tension dissolves into raw desire. They explore one another intimately, sharing fervent kisses and whispered confessions, as each key unlocked deeper layers of trust, passion, and mutual surrender in their blossoming romance.