asuya

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic. 
Just a few days before his death, he became the only Aura user in a world of magic. 
Using his knowledge and experience, he will become an Aura user again, faster than his previous life. 
Accompanied with a shape-shifting black slime, he will make sure to protect everyone he cares about and win against the Evil God Cult.

The Only Aura User In Magic World

The next day after I captured the two spies, we send Ian off as he's returning to Cassau.

"Roy. We're not going back yet, so what are we doing here?" Victoria asked.

"Learning. Albert, you free today, right?"

"Yeah. You told me to clear my schedule for today. What are we going to do?" Albert asked.

Then I looked at Victoria who is confused as well.

"Victoria will teach us about technology from her world, while you will record anything useful and discuss them with researchers. Javier told us about some methods that his first master, Mario did to became the strongest mage at the time, right? And he's supposedly came from the same world as Victoria. I hadn't asked you before, but what do you know about anything Javier taught us? Some of them are something I don't understand." I asked Victoria.

Learning About Advanced Technologies