In the end, Duanmu Huai couldn't hold out any longer and explained part of the situation—of course, he concealed the fact that his avatar in that world was a young girl, and as for the parts he really couldn't clarify... luckily Lumiaire had a sharp mind, and after her explanation, the girls finally got somewhat of an understanding.
"It turned out to be sixty years spent together in the future..."
Ann nodded in agreement.
"It really is wonderful; time can also be used like that, I want to try it too."
"You better not try, it would be troublesome if you can't come back."
Duanmu Huai didn't have the ability to control time; his traveling to the past and future was completely initiated by the system, he didn't have the capability to time travel himself.
"But, Mr. Knight, didn't you mention that Chaldea has that technique called... Spirit Particle Conversion?"
"That's a tool used for transferring to anomaly points, not for time traveling."
