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Umi Hayama (羽山 海己)A second years student just like Wataru. She is Wataru's childhood friend. She is good at cooking and is the one that cooks breakfast, lunch, and dinner for the people that lives in the Tsugumi Dormitory. She has a secret crush for Wataru ever since they were kids, but he seems not to notice.
When Umi was a child, she was very shy. She lost her mom when she was little. She doesn't like to be alone and she always sticks with Wataru when they were little. She goes almost everywhere with Wataru. Some people dislike Umi and her father for special reasons.