Kōichi Ōhara is a supporting character in the anime 365 Days to the Wedding. He is the father of the main protagonist, Takuya Oohara. Kōichi runs a small cleaning company based in Kumamoto. His background as a small-business owner and his location outside Tokyo establish him as a figure representing Takuya’s family roots and a more traditional, hardworking lifestyle. His role in the story is limited to family-related scenes, where he interacts with Takuya and occasionally with other family members. As a father, his primary motivation appears to be supporting his son and maintaining his business. Notably, his occupation and regional setting contrast with Takuya’s urban, white-collar job at a travel agency. Personality traits are not extensively depicted, but he can be understood as a practical and grounded individual who values work and family. His key relationship is with his son, Takuya, and through that relationship he occasionally influences Takuya’s decisions regarding the fake engagement and marriage plot. Development for Kōichi is minimal, as he remains a peripheral character. His notable ability is running a small cleaning company, which anchors him as a small-business owner in the story’s family dynamic.