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Sosuke Kousaka, a young man seeking respite from the city's bustle, moves to a tranquil island in the Seto Inland Sea, expecting to live with his former university senior. However, upon arrival, he finds the senior absent and instead shares his new home with a curious high school girl named Ao and a lone cat named Mikeneko. Together, they navigate the simple yet profound joys of island life, from savoring local cuisine to engaging with the community's colorful characters. Through this unexpected living arrangement, Sosuke learns about friendship, the beauty of nature, and the healing power of a slower pace.