My stepmother and her sister

Mizuna’s sister and Ms. Sawa were parents when they were young. Sister Sana was working in a bar to make a living. She met the man as a guest and agreed to get married. Sana entered the man's house before getting married. However, she couldn't live alone, so she decided to live together. After a while, my brother developed loving feelings for his brother-in-law who was similar to him.