Also a MC of this work. She is a freshman in high school. She lost her mother and her younger brother in a car accident when she was little. She became Hiyori's her sister due to their parent's remarriage. She doesn't know much about playing outside because she had asthma when she was young and couldn't go out much and was often hospitalized. She is therefore often at home, and is often portrayed to be playing a lot of games at home. She also had no experience with fly fishing at the beginning of her work, and she first experienced it when she met Hiyori. Koharu, who enjoyed the fun of fishing and deliciousness of the fish at the same time, became interested in fishing.
Slow Loop
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