Chinami has short brown hair and brown eyes.
- The name Chinami means "wisdom, intellect" (智) (chi) and "wave" (波) (nami).
- Chinami's surname Umihara means "sea, ocean" (海) (umi) and "field, plain" (原) (hara).
- Her name is revealed in Question 53.
- She, Uruka, and Ayuko are come from Nanao Municipal Middle School and participate in the swimming team since middle school.
- She knows Haruma Kobayashi in middle school, and falls in love with him after swimming competition.
- Inside reference - Kawase Umihara is the main character of a series of platform games by TNN/NHK SC, et al. The character is a young sushi chef with a pink rucksack who is lost in an underwater world.