可爱的小女孩莱莉（凯特林·迪亚斯 Kaitlyn Dias 配音）出生在明尼苏达州一个平凡的家庭中，从小她在父母的呵护下长大，脑海中保存着无数美好甜蜜的回忆。当然这些记忆还与几个莱莉未曾谋面的伙伴息息相关，他们就是人类的五种主要情绪：乐乐（艾米·波勒 Amy Poehl er 配音）、忧忧（菲利丝·史密斯 Phyllis Smith 配音）、怕怕（比尔·哈德尔 Bill Hader 配音）、厌厌（敏迪·卡灵 Mindy Kaling 配音）和怒怒（刘易斯·布莱克 Lewis Black 配音）。乐乐作为团队的领导，她协同其他伙伴致力于为小主人营造更多美好的珍贵回忆。某天，莱莉随同父母搬到了旧金山，肮脏逼仄的公寓、陌生的校园环境、逐渐失落的友情都让莱莉无所适从，她的负面情绪逐渐累积，内心美好的世界渐次崩塌。 为了保护这一切，乐乐只有行动起来……收起
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