In the House

Touko's husband's lover is about to start living together with her family and her. Add a handsome and mysterious young man who has feelings for Touko into this mix and we have the start of an unusual living arrangement together.

What is the shocking reason behind Touko's decision for this strange cohabitation?

source: https://www.mangaupdates.com/series/ihzp4dq/in-the-house