Auau! I have been looking forward to this 'real start', but somehow I got confused and thought we were still on the info pages! And that I would have all of next week to post all sorts of random commentary.
Anyway, yes, finally! It must have been so exciting for in-real-time readers to reach this point, and meet these characters for the first time.
I don't hate Lalli's room. It seems cozy, with everything a person needs, and it's all his own. I would imagine that young soldiers often have to share? Well, Lalli may be young, but he's been in the military for years. Although... his 'job' doesn't sound strictly military, if it's something that allows for casual firing/quitting. Also: is Lalli's place even in the barracks, or civilian quarters? the fact that it's behind a wall suggests the civilian quarters on the map, doesn't it?
It's amusing to me to remember that Lalli's default expression used to be confusion. By Adventure Two it seems to be annoyance.
Onni's default expression is more consistent but, wow, his facial structure looks very different to me than Adventure Two Onni. Tuuri is just adorable, in her excitement!
And I like how Onni says he would never call Tuuri an idiot, then proceeds to do so right afterwards.
The interaction with Taru is weird indeed. I agree that she doesn't seem to run in the same Keuruu circles as our heroes. As for how she seems to know the older ones, well, is it possible that she only really met Onni when she offered him that job? (She's also right that Tuuri and Lalli are good at their jobs, so she lucked out there!)
Oh, and I don't think Lalli tends to freak out when touched in general? Later, Tuuri will tell a train employee that he won't resist just being put on the train. (Which is worrying, actually.) I think it's possible that he avoided Onni's later hug to avoid the emotional side of it.