Kōichi, formerly known as Sekiguchi in his corporate career, left the business world after an illness and transitioned to hosting. He joined Club One, rising to become the No. 1 Co-Leader. Despite projecting a youthful "younger brother" appearance and vibe, he possesses over 20 years of experience in the host industry, making him a seasoned veteran whose established tenure contrasts sharply with his fresh and approachable demeanor. > His effectiveness as a host centers on his friendly and easygoing style. He specializes in making guests feel comfortable, relaxed, and at ease, particularly soothing nervous or upset patrons. His cheerful, calming presence consistently uplifts guests during their time at the club. This ability stems directly from his extensive experience and innate understanding of hospitality dynamics.