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Yellow Angel, Kor, settles in a new place. One night, he is awakened by the melody of a ukulele played by Blue Angel, Dium. A bond begins to grow between them. They communicate through question clouds and spend more and more time together. But over time, everything changes. Kor keeps sending his messages but receives no reply. Absorbed in rehearsals with his band, Dium drifts away from him. When Kor discovers that Dium is packing his suitcase and preparing to leave, he stands on his last cloud and watches as the train approaches. He has only one chance left to say what has remained unspoken for so long.