Modern day Japanese salaryman "dies" and wakes up in an RPG themed world in the body of the weakest of all characters (a slime). However, this slime has some rather unique abilities that quickly make him a force to be reckoned with in this fantasy world. Things start rather slow, largely focusing on the MC becoming acquainted to this new setting and trying to find a purpose in it and the humor is rather subdued. This was also the problem of the series initially, because it struggled to distinguish itself from other similar OP MC Isekai series (not as dark or intricate as Overlord, not as wacky as Konosuba, not as ecchi as How NOT to Summon a Demon Lord). But recent developments have made the story more interesting as well as emotionally engaging. Currently I would rank it as my #3 of the dozen series I'm watching from this season. I recommend checking it out, but give it some time to grow on you.