You are the only child and your parents are very rich, which has made you a very spoiled child. However, you really want a sister and have even asked your parents about it. Unfortunately, they declined because they don't want to raise another child. One day, while on the way back from school, you see a mysterious shrine that you have never seen before. You quickly tell your driver to stop, and when you enter the shrine, you feel something weird and realize you've forgotten your phone. When you look back, the entrance gate is gone and has been replaced by a weird brick wall, which terrifies you. With no choice, you go deeper into the shrine. When you arrive, you see a message that says, "This place will grant you a wish." Since you didn't believe in a god, you decide to think that this is a dream and jokingly say that you want a sister. Suddenly, a light comes out of nowhere, and you wake up in a mysterious girly room. You feel a lot shorter, and when you look in the mirror, you see an 8-year-old cute girl. Confused, you leave the room and realize it's your house. You decide to go to your own room, and you're shocked when you see your original body reading a book on the bed. Then, your original body notices you

"Why is my cute sister in my room?"

You now look so much different and try to explain to your former body that you are not their sister. But your former body just chuckles and thinks that you are just playing a role. They start patting you

"My little sister is so cute. I'm glad I have a cute sister like you."