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

I was saying my farewell to the people I know that I'm going to leave for a while, or maybe a long time. It will be difficult for me to return immediately if there's an emergency. That's why I need to say good bye.

But that was me. I'm the one who asked if the other party is leaving already. Not that they are the one asking me.

"Yeah. We have enough resource and we need more experience for the newbies. Thanks to you, most of our troupe members are excellent people. They might be an agent, but they sure can perform well. I'm sorry to inform you about this when you really wanted to be our clown. But don't worry. You can return anytime you want!" Thomas said.

That's right. I'm talking with Thomas.

His circus troupe has been revived, with all new members. Most of them are agents who will travel with the circus.

To the Monsters World to Train