Kishida fumio (Ichihara Hayato) is an ordinary college student. One day, he happened to meet his classmate (Juri Ueno) and was drawn into an independent film production team headed by Kwai. In addition to film activities, Kwai often helps Ye Zhi solve his love troubles, and they become good friends who talk about everything. Unconsciously, the relationship between Kwai and Yu transcended friendship and became subtle.

Carefree college life is over, and Zhi has been unable to find a satisfactory job. Under Kwai's introduction, Chi also joined a small film company as a handyman. In order to become a film director, Kwai is going to study in America. Before leaving, Kwai and Chi also met once, but in the end they failed to express their inner feelings.

One morning, Zhi also looked up and saw a beautiful rainbow. He photographed the beautiful scenery in front of him with his mobile phone and sent it to Kwai by voice message, but Kwai didn't reply.

Soon after, Chi also learned that Kwai died in an air crash in the United States.