I can totally understand you, but honestly i would much rather prefer this over mangas that drag shit on for good knows how many chapters. Also i think the reason the negative mp doesn't affect him is a part of a gag i think?
Also him taking a vacation isn't going to be that interesting is it? Like he's clearly someone who is work oriented, so to him, taking a vacation that too in a different world is going to be hard. Plus he's kinda famous as well, so a vacation is going to be tough without being recognised and being regarded too highly (which ig the mc doesn't like)
Isnt he the summoned hero or something that’s why he isnt affected much of the negative MP? Like the dragon said
After having negative mp, his hp is the one to be reduced if he contiues to use his mana. So that affects his health. And yeah you're right, it would be boring if he went to a vacation. But it would still not be a vacation because there will always be a part where he has to fight something and be misunderstood again. It's the same cycle all over again.
I love this but there are a lot of problems. What I don't like is he's been having doubts that he's in a dream in the first part, but it just stopped. And he's seriously overpowered that I think this is going to end in chapter 100 or something. Like, I think he has a skill where he just thinks of a spell and he will get it, with no practice at all. And shouldn't you have a compatible attribute? He just suddenly had an attribute of ice and fire. In "Tondemo Skill de Isekai Hourou Meshi", the MC there has an attribute of earth and fire. He recieve blessings from the goddesses but not the others because he isn't compatible with their attribute, so his familliars are the ones to recieve them. Mc's slimes are so useful and op too, everything he do becomes easier, and the chapter ends fast with him using his slimes. And about the negative mp, shouldn't he atleast faint, or be bedridden for a few weeks after using too much of it? I mean come on, -200k+ mp? Shouldn't you die with that much negative? I understand that he was "a corporate slave that lasted five nights working and having to do over-time with no heater on a winter day", but his physical and mental health should come first, Jesus. He suddenly got super strong just because he defeated a stronger dragon that made him surpass his limits(or not) without fainting or dying. I don't think he's even sleeping or eating well at all. And is it really necessary to go to another town and accept a quest right after defeating a strong monster with negative mp? Why doesn't he atleast go on a vacation and relax when going to his next destination??? I think it just took him 7-8 chapters to investigate, defeat a monster and go to another town. Also, even when he knew that there were rumours about him is circulating and that would raise suspicion to that Blue Moon of Salvation, he doesn't put effort to hide it nor fix the rumours. He even said to that guild leader "No, it's fine" after saying he can't completely erase the rumours. In my 42 chapters of reading this I realized a lot happened but I only finished 42 chapters? Unbelievable. Thought I was reading 60 chapters or something. I don't know what came over their heads when they decided to make this into an anime but this is a little bit of a mess.
P.S. I've watched the anime and they totally trashed it!!! The artstyle doesn't match the manga at all. And he has a different personality in the anime! They made a very big jump on the plot. It didn't even show much of how he got into the world and how he became an adventurer, they just showed glimpses of them. I'd prefer to read the manga than watch the anime. I recommend not to watch the anime, you will be very disappointed.