桐島 三羽

Reiichi's younger step sister. Due to her bad attitude, she has no friends and is actually very lonely. Reiichi invited her to the AI research club.

"...Nii-san, you are not only disgusting, but also so stupid, aren't you?"

The true Observer and the only human (clone) from the real world in the game. In order for humen to not hurt each other, each time human login in First, the new world is created. Therefore, Reiichi and others are nothing more than AIs in her world.

Miu was created as a clone of her mother's dead daughter, but the mother died before accepting her as her real daughter. In order to get approval, she logged in the First and created an AI of her mother. Still, no matter how hard she tried, she was not accepted as the real daughter.

With her creator's death, Miu was waiting for disposal. She was given a job: to kill AIs who go out from the virtual world. But, in the end, she could not bring herself to kill Reiichi, whom she admitted as the real brother.