[Comicalization] The Fake Sister is Targeting My Fiancé [Anthology Included]

I don't have a younger sister. Or at least, I'm supposed to not have one. Yet before my eyes, there's a younger sister talking intimately with my fiancé. I set out to uncover the true identities of my fiancé and this sister! It will be serialized and included in "I'm a Villainess, But I'll Achieve Happiness! Anthology Comic - Serves You Right Edition Volume 4" published by Ichijinsha on 5/30! Please look forward to that as well!