Slut Metamorphosis is a NTR (cheating) themed visual novel. Make choices and read through the story from both the male and female protagonist's perspective.

You are not doing well financially when an older family friend Shoji offers to help out and lets you and your girlfriend Lana live with him in his fancy home until you get back up on your feet.

What you don't know is that Shoji might have ulteriot motives with your girlfriend... As you live in Shoji's home you notice Lana's outlook on life has been changing. She's always been a fashionista who wears a lot of makeup and dyes her hair blonde with a modern look on life, but lately she seems to be adopting more traditional Japanese norms and values...

[From Steam]