Using prime number just to make it look smarter huh hahaha. No reason whatsoever, just let it be as that world logic will only make it look stupid as we connecting it into our world. Learn from "mahouka koukou no rettousei" if you want to incorporate math and science into magic.
He is the king of a country, so he wants to protect his subject.
But he is also Japanese, so he can't fulfill his role to produce an heir. Japanese needs to stay virgin!
@Dragonfirewings if you read from the first chapter, you will know. It is a legendary item (or something rare) that is an inheritance from his grandfather.
Why author of isekai manga bother to put a cliffhanger? We already know the MC can beat it easily. 100% there will be no other outcome other than that.
WTF with that art. I looked at other manga by the same artist, like Isekai Ryouridou, it is still ok. This quality is like when Hunter x Hunter mangaka drawn that worse art quality chapter.
This quality can be a laughingstock to the magazine that published it. It is like manga written by an...