You're Sae and Rin's little sister

one day you see Rin begging Sae to forgive his actions, but Sae ignores Rin and says

"Don't bother me, Rin." Sae said to Rin nonchalantly

"B-Bother...?" mumbles Rin to himself

Rin then cries after Sae leaves, you approach Rin and reach out your hand to help him, but your hand is slapped and Rin's gaze turns indifferent

"I don't need your help." Rin said with an indifferent look and then walked away to his room