Revenge: Mrs. Wrong manga volume 1 features story and art by Sayo Momota.

Timid Tsukiko has a strained relationship with her beautiful sister Mitsuki. Whatever her domineering sister needs, Tsukiko complies--even pretending she's her sister on dates! But when Mitsuki gets engaged, and Tsukiko stands in for her at a wedding planning meeting, she ends up falling into bed with Mitsuki's fiance! Tired of playing second fiddle to her sister, Tsukiko decides to take something for herself for a change. In this startling tale of intrigue and romance, revenge is a dish best served steaming hot!