Revenge (YAMORI Ten)

Megumi returns to her family home with her fiancé, Shinji. Normally, it should be a happy occasion, but Megumi can’t shake the uneasiness in her heart. The reason is her twin sister, Michiru, who still lives at home. Time and again, Michiru has stolen the things Megumi treasures most—her boyfriends, her savings, and more. And this time, she has set her sights on Megumi’s fiancé, Shinji...

“I won’t let her take anything precious from me ever again!”

Megumi makes up her mind to protect what is hers, but... A fierce battle between the sisters is about to begin!

About the original webnovel: Author's blog. The original novel was titled "毒妹戦記"