These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Dual! Parallel Trouble Adventure
Angst? What Angst?: So Kazuki's just been sent to another world, his parents have no idea who he is, he has to fight constant battles for a chance to get home and he lives with two strangers, one of who tends to lash out at him and the other isn't that great a parental figure. Despite this he seems to spend more time thinking about mechas and standard harem protagonist problems.
Well considering that he was essentially a social outcast in his world and the mecha fights he has to deal with aren't particularly life threatening (at least at first) it's understandable that he isn't too saddened. The biggest worry he would have is how his parents are reacting to his absence but Kazuki would be smart enough to rationalize that A) Dr. Sanada would probably give a cover story so the police aren't banging down his door (Kazuki was last seen with Mitsuki) and B) the quickest way back to resolve it is to just end the war.