Standard Japanese manga - meaning we have a standard herbivore Japanese MC. The problem? Like Nadrious said the EQ and IQ of our MC is lacking. He might be a good chemist but everything else is lacking.
Why is it a problem? This manga tries to dabble both in comedy and drama. Creates dramatic plot points while macking our MC dumb in general but smart in current situation. Many problems could have been resolved but are being shadowed by action-comedy-gag manga.
You transmigrate to another world? Instead of thinking how lovely your wife is, you would normally try to understand who you are and what you are.
Need an alias why you changed? You hit your head and got an amnesia. This is normal and plausible.
A grown a s s man acting like a high schooler in your standard Japanese school life rom-com.
Lastly this looks like more of a propaganda manga to stimulate young Japanese males (before age of 15) to take interest in science studies i.e. chemistry in this case. Though instead of motivating them becoming interested in science i think they should motivate them to act like normal men to stop their active depopulation.