My little sister, Yukino-chan. Her clear eyes radiate a pure innocence that always stirs my heart. Her snow-white skin and soft, plump cheeks have a soothing effect on anyone who sees her. Whenever I call out my favorite name, she always comes over with a smile, drawing me in. Lately, while bathing together, I've noticed Yukino-chan's breasts seem to have grown slightly. This change makes my heart race.