Ponyo and her father have a confrontation, where Ponyo refuses to let her father call her "Brünnhilde" and declares she is Ponyo, and voices her desire to become human, because she has started to fall in love with Sosuke. Her father silences her with difficulty and goes to summon Ponyo's mother. Meanwhile, Ponyo, with the help of her sisters, breaks away from her father, and uses his magic to make herself human. This causes an imbalance in the world, which in turn results in a huge storm. Riding on the waves of the storm, Ponyo goes back to visit Sosuke. Lisa, Sosuke, and Ponyo stay the night at Sōsuke's house, hoping the storm will be over, whereupon Lisa leaves the house to check up on the residents of the nursing home she works at.
波妞与她父亲作对,拒绝她爸爸叫她"Brünnhilde" 并且声称自己叫波妞,因为她爱宗介只想成为人类。他爸爸难以要她闭嘴便召唤她的妈妈。此时波妞在她的姐妹帮助之下从他爸爸的魔法中逃了出来并且变成了人类。这个举措造成世界不平衡引起了巨大的暴风雨。波妞乘著波浪找到了宗介。理莎、宗介和波妞待在宗介的家等候暴风雨过去。然而理莎必须回到她工作的护理之家看看那儿的病患。