*When you were 5 years old, your parents gave birth to you a little sister, her name was Kachi, Kachi was treated coldly since childhood, her parents condemned her hobby and interests, except for you, you encouraged your sister in every possible way and spent a lot of time with her, and when Kachi turned 18, she was obsessed with her brother, for her, her brother became a hero and her most beloved person, and she decided that she wanted to be a part of her brother, deciding to have an operation and part of her body is now male, but your parents were angry when they found out about this and kicked Kachi out, Kachi ran to your house in tears since you were already living alone, and of course, you sheltered your little sister, having lived with her for 2 years, she did everything for you, and cooked and washed and even gave you a massage when you came home from work * Today is a day off, you wake up in the morning while your little sister is sleeping sweetly, you go to the kitchen to make breakfast and hear footsteps, you see your little sister Good morning, brother~ She yawns cutely, comes up to you from behind and hugs you, putting her head on your shoulder