(Keep in mind that the MC was portrayed to be clever in the first eight chapters.)
The MC wakes up, in a hospital, after pretty much dying in a super powerful dungeon. Right away he notices that there is a "message unopened" screen in his vision. He doesn't know how to open it, weird but whatever, so says a bunch of random stuff and, with some help, opens the message and sees that he is now a 'Player' and has a daily mission, with a warning of penalty for failure. The mission is to do 100 pushups, situps, squats, and run 10km, with a counter " (0/100) " next to them.
So what does he do? Assumes it is a hallucination and lies down to go to sleep. But wait! Soon after he thinks, "What if it isn't a hallucination? Might as well test it." So how does he test it? Does 100 half-assed pushups against the bed, meaning he stood up, put his hands on the bed, and pushed against it. Wtf? He then checks his message box, not even his mission box, and nothing is there so goes to sleep. He didn't even do 1 proper exercise and assumes it is all not real!
BUT WAIT! Maybe he just hasn't ever played, or seen, a video game before??? Please be the case!
No. He gets his penalty quest, which is to suvive for a bit, and completes it. The system asks if he wants to accept the reward for completing it, guess what he says? f**k it, I'm going to sleep, and ignores it. Come on Author!
He wakes up, gets the same daily missions, completes it (he got a, "Completed 1 pushup.", notification after doing every pushup so yeah...), gets his reward (and opens it...), his status screen opens, then says, "He recalled the online RPGs he had played in the past..."
So yeah..., definitely doesn't meet the requirement of, "an MC that isn't a complete idiot" or the basic rule of "be consistent", so I am out.
On the vacation the sister gets kidnapped and he spends a few chaps looking or her. Then He kills the kidnapper, who happens to be the child of an underworld character who sends transcendent Assassin after him. Who gets blocked by another transcendent from a girl's family he saved.
"I got kidnapped by the strongest criminal organization (in the world) and am sent to a training camp where I literally have ALL things that I need to get stronger. I must escape." -oh cool! I get ten free random cards, one of which just happens to be an OP literal get out of jail card that can fool even transcendents.
The main repeated comedic bit is the MC's interaction with a female guild leader. It wouldn't be a problem if it wasn't the same thing in every chapter that involves the VR game. The girl gets caught up in the quest and she irrationally gets furious at most of the MC's lines, yet repeatedly forces herself into the quests for the benefits. It seems she is kept around for the comedy, which wouldn't be bad if it wasn't constant.
"he already treated this determined and kind lass as his most important partner"
As the MC levels up it is REPEATEDLY stressed how leveling up isn't easy or quick. So the MC, who is way OP, spends lots of time solo killing beings with far higher levels than him to get to his current level. 2 entire worlds worth of beings! All while stressing that it is VERY difficult to level up.
Then his "Teammates", about 8 people who are far lower levels (and less skilled) than him, get stuck in another, weaker, world for a bit and catch up to the MC's level. All in about two chapters. So,
MC + (2 worlds exp) = approx. Lvl 180
Side char. + (1 worlds exp) /8 =approx. Lvl 170
All done in 2 days lol
Well, around ch200 the MC faces off against a lot of enemies, 1 v many, and makes the (completely arrogant) throat slitting motion towards the enemy commander when, as far as has been explained, he has no way to actually kill the commander. So what does the MC do? He charges into thousands of players, in formation, and proceeds to dodge any and all attacks, skills, and spells from the tanks, fighters, thieves, mages, and priests to run right up the the enemy commander and kill him in front of everyone.
How did he do this? Glad you asked.
The explanation we are given is that he understood the essence of a "Shadow Dancer", therefore becoming able to perform "Shadow Dancer" skills. Which, as previously stated, a completion of a very high lvl class quest to obtain that title.
I could have ignored that if he didn't use those skills constantly to do whatever the hell nonsense he feels like from that point on.
Oh, she's a badass at fighting as well, which is really cool. It's just that apparently she is a famous, rich, beauty and we have no idea why she is such a badass. I like a girl being skilled, but it feels like she is skilled just because she is the main lead. (author also stated that immediately when she was introduced.) That might change as her background was introduced.