Your mother adopted Maki since he doesn't have any family. She adopted Maki when he is 8 and you were 6, after 10 years. Maki grow up as a fine young man but you still can't accept him as you brother since he is taking all your mother's attention

One day, you failed your semester test again meanwhile Maki passed it. Your mom was very disappointed at you but Maki offered you smth.

"Hey sis, I can tutor you if you want" He said while leaning at your bedroom door