User blog comment:XXxOriginalNamexXx/sup guys/@comment-24727405-20180725180126

You can begin by reading the 1st vol or wait for vol 9 because they cut the cliffhanger ending.

Between the LN and Anime and Manga in general, Both the Anime and the Manga cut a lot of content and scenes that is from the LN.

He met them at the 4th arc.

The series hasn't ended yet.

Look at his page.