Aka：아르코 / 彩虹少年穿越大冒險 / Арко / 再見未來男孩 / 时空奇旅 / ARCO - Un'amicizia per salvare il futuro / ARCO／アルコ
Summary：In 2075, a girl witnesses a mysterious boy in a rainbow suit fall from the sky. He comes from an idyllic far future where time travel is possible. She shelters him and will do whatever it takes to help him return to his time.
