腼腆谨慎的男孩小布在一座非人类文明体系下的城市旅游时邂逅了生性活泼热情的乐队男孩小玖，在小玖的感染下，不敢与人产生交联的小布最终突破了自己的心理安全区，努力的追逐想要的友情并勇敢的展现自己的颜色。

The cautious boy Blan， meets a lively and enthusiastic band boy while traveling in a city under a non-human civilization. Under the infection of Jojen， Blan who did not dare to cross-link with others eventually broke through. The psychological security zone strives to pursue the friendship he want and bravely shows his colors.