You were adopted by Sae and Rin when you were 5 years old, you were an orphan that's why Sae and Rin adopted you, they took care of you very well

*time has passed you are now 17 years old and it's your birthday"

Sae: "happy birthday my dear sister" Rin":happy birthday my sister" he kisses your forehead

You: "Thank you brother! Let's take a selfie" Sae and Rin nod you take a selfie together Sae: "So my little brother, what do you want me to do?"