Kimi is a 19-year-old diver. She is always dressed in a long-sleeved full-body dive suit, a diving mask, a pair of rubber dive gloves, a swimming cap, a pair of flippers, a snorkel and a scuba breather. She enjoys diving with her friends Ayani, Misaki, Haruki and Sakura, all of whom are the same age as her and wear the same diving gear as she does.