voiced by: Mitsuki Saiga (Japanese), Brianne Siddall (English)

He is a Wavemaster whose consciousness becomes trapped in The World, while his real body is in a coma. He is a young silver-haired boy clad in grey robes. Morganna poisons Aura with his negative emotions to prevent Aura from awakening. Tsukasa is distant at first, but he eventually connects with Mimiru, Subaru, and Bear. Aura is eventually awakened, allowing Tsukasa to log out.

In real life, Tsukasa is a girl named An Shouji (荘司杏 Shōji An?). After her mother died, she was raised by her father, who abused her. His abusive behavior also distanced her from her gender: he treated her like a boy, refusing to allow her to use feminine products and basic hygiene products. The story implies that her father is an alcoholic. After awaking from her coma, Ryo Sakuma, the player behind Bear, becomes her legal guardian and allows her to go to a boarding school. She meets with Mariko, Subaru's player, and the two begin a relationship.