In typical fashion, there's a lot of dumb shit in this series. Letting bad guys live is one. I don't know why Japan has a boner for this, but bad guys going free or not being killed is not a good thing. You aren't being a "moral person" but letting literal kidnappers go around scot free. Second, how he managed to gain zero information about the outside world is another dumb thing since they openly trade and he's met a human from the outside world. He could have easily gained information and met with a human periodically to study things. Third is the whole "100 years" requirement - there's no real reason for that except tradition, and he's already way beyond the norm - him accepting it so openly makes no sense. Also him losing his concept of time so readily in a lot of ways doesn't make much sense, as he has 30 years of formative years as a human. Sure, he'll lose a bit of it, but the way he acts is like he never was human. Generally this is circumvented by having characters "remember their past life" instead of reincarnating, because the logic works out better. Yes the past life is rarely important in isekai series, but they've even forgone every tiny bit of his human experiences except and only kept the tiny pebble that was his want to "make a mark on the world"
Generic is as generic does, but this is above average on the scale, so we'll see if it remains interesting.