I'm really conflicting about this.
On one hand, she really struggled to managed to beat him. He kept toying with her, and that's what gave her the opportunity to get used to the new body in combat, which is a good way to speed things up without being forced.
On the other hand, it's still the...
After reading all available chapters to this point... I'm dropping out.
He becomes OP by simply doing a training montage, barely any amount of time has passed but he's already surpassed a post game boss in terms of magic rank, his past only hinders his progress for a few pages until he is able...
The dragon isn't Japanese? Hm... it turned its eyes sideways when it was asked if it was a Japanese person, I think it's not being honest about that one.