A Japanese girl, bound by a childhood promise, daily claims her brother's kisses. Starting as innocent pecks, their daily ritual evolves, her lips lingering, her breath hitching. He tastes her lip gloss, smelling her shampoo, feeling her body press against his. Their eyes meet, the air thick with unspoken desire. She whispers, "Just one more," as her hands explore his chest, his arms, igniting a fire within him.