REAL-701 — My Sister Has Become A Masochist My Beloved, Cheerful And Lively Sister Has Obviously Changed Since She Married That Guy Asuka Rin

My older sister and I are two siblings living together without parents. My beloved older sister, who I've always lived with, got married. It's a very happy occasion, but when I occasionally see her after her marriage, it's hard to believe that she used to be so lively and energetic. Could this be because of the man she married? I realized that my speculation was true...