Middle-aged Japanese Men after getting isekai'd: : TenseiSlime

A Middle-aged Man Who Returned From Another World Becomes Unrivaled In The Apocalyptic World - MangaDex

I'm with Rimuru on this : r/TenseiSlime

Slime and Skeleton : r/overlord

10 Must-Read Manga About Slimes (That Aren't Reincarnated As A Slime)

Why is isekai anime surging in popularity? - Quora

At this point, the whole fandom seems to forget about this guy : r/ TenseiSlime

Just a 37 year old man : r/TenseiSlime

What isekai concepts are yet to be explored? (60 - ) - Forums

anime_irl : r/anime_irl

A Slime, a Sword, and a Spider get isekai'd : r/TenseiSlime

if you don't know what to watch next after Tensura, I recommend you this series. Instead of a Monster it's a Human that build a Monster Nation : r/ TenseiSlime