[Concave-Convex World] You Are My Brother!

Fifteen-year-old Gray rescued an injured girl while practicing on a certain planet, and then... Girl: (blinking big eyes)... Well, are you my brother? Gray: (confused)? ? ? ? ? ? ? Girl: (Happily) That's it! Gray: Don't follow me, I don't know you. Girl: Yes, but, I only know you! You are my brother! Gray:... Who said that? Girl: (smiling) Me! Gray:... Don't talk nonsense. Girl: No! Look at your eyes! Isn't it purple? Only brother can you have such beautiful eyes! Me! My favorite brother! # Gray is also looking at the cheap sister very hard today # # The younger sister said that the elder brother is the best # # The real elder brother said that he would beat the kidnapping sister above to death # # longevity contest 4th and the 2nd in the contest are fighting again # ## ———————————————————————————— ①This is my first time writing a fanfic, please forgive me for the writing style. ②The characters belong to concave and convex, ooc belongs to me ③ Please wait for updates ④cp needs to be thought about