Tougenkyo - Aniyome to Sono Haha ~Isourou Shiteita Ani no Ie ni Yome no Haha ga Korogarikonde Kita Kekka www~

The protagonist began to live with his brother and sister-in-law due to entering university.
However, he was moved by his brother'wife Eriko, who used to be a model.

One day, her mother Marino fought with her husband, left the house and came to live with them.

That event created ripples, like a stone being thrown into quiet water, and started to affect their relationship...