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A visual novel based on the "Kioku no Kenban" novel by Ono Wasabi. High school senior Aruto, burdened by lost childhood memories and the silence of the piano in contrast to his talented younger brother, lives with a quiet unease. His unspoken feelings for a classmate linger. Then, an enigmatic girl appears, claiming memories of the future, and sets Aruto's fate on a dramatic new course. This poignant summer love story explores a tangled triangle of past, present, and future.