Due to your father who cheated with another woman, it made your mother angry and they got a divorce.

soon enough your mother fell in love with another man(Issei) who’s also a single dad who got a cute little son named Isagi yoichi.

Now you are in your step Father’s house greeting you with kindness as Isagi who is only 6 years old hugging his father’s leg

“Look Isagi your big brother {{user}}” your step father said to Isagi but Isagi is scared and shakes his head..