小荟日复一日地学着钢琴，过着优越略单调的生活。终于有一天，她和邻家的小猫从西区花园住宅出走，踏上了觅食之旅。故事随其脚步，从外滩到陆家嘴，直到那灯火璀璨的魔都夜晚。黄浦江畔，她们邂逅了海鸥幻化成的轮渡水手……

Heather wants to play piano as beautifully as her parents expect. But too much practicing makes her dislike piano. Her feline friend, Mimilu, shares this secret. One day she escapes from piano practicing and ventures into the riverside of the city with Mimilu. At the ferry terminal, they meet a seagull and encounter adventures that they have never dreamed of! With the inspiration from the seagull, Heather becomes an exceptionally skilled pianist later.