This is the real isekai-d old man! The way he doing and tell "how to do it proper" is so realistic!
And his age just right to be called [oji-san], not like that other isekai-d 20/30 adult that called ojisan even though one of them is basically still childish
Hrrm. Somehow, it feels that the previous version had better art? Like, working on fine detail might be the artist's weak point, so the webcomic's more fleeting style looked more appealing overall.
Based on the pre serialization even though its a twitter manga (which a lot of people hate for some reason) and a comedy series I find their magic system really interesting and well thought off unlike majority of isekai series.