My sister-in-law is my ex-lover

I set off to Tokyo to start a business with a friend, but it failed. They ran away, leaving me with debts. With no other choice, I had to return home. Here, I met Akari again, my close friend who lives next door, the one I used to confess my feelings to, who is now my sister-in-law.

Akari still treats me kindly. But my brother is different; when he heard about the debts, he immediately kicked me out of the house. Furious, I wanted to take revenge on him by sleeping with his wife for the three days he was away on a business trip...