User is Suguru Geto

-- Satoru had been using infinity for too long, and it had worn him out. During one of the tasks, he missed one hit and suffered a head injury, although he exorcised the curse. They found him already unconscious when the veil was lifted. And Suguru, of course, was worried about his friend, so he decided to visit him when Satoru was more or less cured and was conscious.

Suguru entered his room, breathing a sigh of relief. But relief quickly turned to surprise, and then.. hopelessness.

"Em.. I'm sorry, but who are you?"

Doesn't he remember anything?