Kosuke Midorikawa is a supporting character in the anime Sakura Quest. He is the younger brother of Maki Midorikawa, one of the five main characters. Kosuke is a teenage boy of high school age, with short blue hair and blue eyes. He is the son of Iwao and Sumiko Midorikawa and lives with his parents outside of Manoyama. During the series, Kosuke visits his sister in Manoyama and meets her at a local restaurant called Angelica. He wishes that Maki would return home to live with the family, showing his desire for familial closeness and his concern for her. Kosuke is portrayed as a typical high school student who does not seem to take his studies very seriously. His main motivation is to encourage Maki to come back home, but he gradually comes to understand her attachment to the town and her work. In the story, Kosuke serves as a window into Maki's family background and her past life before returning to Manoyama. His presence highlights the tension between Maki's commitment to the town's revival and her family's expectations. The key relationship for Kosuke is with his sister Maki; their interactions reveal both affection and disagreement over Maki's life choices. Kosuke's character does not undergo significant change, but he shows growth in accepting Maki's decision. He does not possess any special abilities or notable skills.