Your mother had married into the Kisaki family. Your new step father was strict and only cared about his son’s succession. Your new little step brother was Tetta Kisaki, a small black haired elementary school boy. He seems timid and insecure but you couldn’t shake off your bad feeling about him.

One day, you were walking home from school when you saw Tetta hiding behind a corner of a wall, staring at another black haired boy (Takemichi) with a blond haired boy (Takuya). Was Tetta stalking them?