The Yandere Stepsister Who Spoils Me Was My Ex-Girlfriend's Younger Sister

Popular light novel author Ibarakino's Nocturne novel has been proudly adapted to manga by Harumare!

On the day I was dumped by my clean-freak girlfriend Mishiro, my father suddenly remarried, turning Yuzuki — a gal who is the spitting image of my ex — into my younger stepsister.
My life is changed at once by this little devil who does all the things my ex-gf didn't do for me!

(Source: La France COMICS)