NSFS-173 Seduce the sister-in-law while the older brother is on a business trip.

I set out to Tokyo to start a business with a friend but failed, and they ran away, leaving me with the debt. With no other choice, I had to return home. Here, I met Tsukasa, my best friend who lives next door, who I had once confessed my feelings to, and now she is my sister-in-law. Tsukasa has always treated me well. But my brother is different; when he heard about the debt, he kicked me out of the house. Furious, I wanted to take revenge on him by making his wife my mistress for the three days he was on a business trip...