Umi is the second cousin of Hairi Takahara who has lived her whole life in the city, but she always admired life in the countryside and it’s the reason why she has come to Torishirojima for the summer. During the summer, she often cooks for Hairi. Her specialty is fried rice; she's extremely passionate about fried rice.

Spoiler

She is the daughter of Hairi and Shiroha in the future.