Interworld Traveller?

Rei shrugged his body and said that magic never existed in his world before. The only magical stuff he knows were the superior technology that was barred from him to interact.

"That is all I know. My body is still the same, but I am not in the spacesuit, nor the people around me knew what I was talking about. They nearly wanted to throw me in an asylum for saying rubbish out."

"Only then, a male nurse came to talk to me and asked if I was having some weird condition called the 8th grade syndrome. I refused and told him I was sane until he came close to me, and told me that it's fine to act that way."

"As long as I do not show it during the real test he will teach me the ropes on how to 'blend' into the 'real' world and ironically because of him, I managed to pass the psychiatric exams." Rei later said that the male nurse revealed his true identity as the 'Dark Dragon Slayer'.