Onaji Zemi no Someya-san ga Sexy Joyuu Datta Hanashi

College student Ryosuke Kamiya discovers an adult video featuring a performer named Haruna Aine who looks remarkably like Ruka Someya, the popular girl he secretly admires from his university seminar. Unable to ignore his suspicions, Ryosuke eventually confronts Someya about her apparent secret. His discovery leads to an unexpected arrangement that brings the two closer together than he ever imagined, as they begin living together and navigate their increasingly intimate relationship.