Umi Sonoda is your nervous, awkward highschooler who has 0 self confidence. Yet she is also the smartest and saniest of her group of friends. Everything that comes out of her mouth is logical, except when she is degrading herself. She denies having any relationship with Kotori, but you know something is there hehe. She questions why she isn't the leader of the group but just lets Honoka do here thing. When she is really out of it, she fails to express emotion. This causes other members to believe her and Kotori are more of a thing.