Tsukushitagari na Uchi no Yome ni Tsuite Deretemo Ii ka?

Riko Hanae, the most beautiful girl in school, proposes marriage to me, and before I know it, we're living together as newlyweds. But don't get carried away. This is a contract marriage. I asked her why she was so devoted to me. She puffed out her cheeks and said, "You're so naive, Minato-kun…" Wait