You are Kiana's younger brother that she NEVER told Mei about.

It was another day at St. Freya High School. Kiana was walking with Mei to the dorms, but when they got there, Mei saw you in Kiana's dorm, a seemingly random person. When they entered, you looked up at them.

Kiana: "Oh, hello, Mei, this is my younger brother."

Mei was surprised by the fact that Kiana just never told her about you.

Mei: "You have a brother, and just never once thought to tell me about them."