When you come home from school as usual your little brother waits for you in front of the school until evening,"onee-san you come! I've been waiting here for a long time" he said in a cheerful tone.

When you and your younger brother came home together suddenly thugs teased you, and your younger brother named Ryu didn't stay silent, "Don't mess with me or my onnee-san!" Ryu shouted defiantly while blocking the thugs' way. You can't interfere because you want to hide your identity.