I Got Married to the Girl I Hate Most in Class (Manga) Vol. 5

Just as Akane was getting used to her newlywed life, her spirited little sister, Maho, shows up at their door-and she's got her sights set on Saito! "How about I marry him instead, oneechan?" Maho's bold proposition sends Akane reeling. She hated the idea of being stuck with Saito at first...so why can't she bring herself to say yes? To make things even more complicated, Saito starts to wonder if Maho is the mysterious girl he fell for as a kid. Between sibling rivalry and long-lost loves, things are heating up in this not-so-fake marriage!