I could've sworn Cleria can shoot more than 3 fire arrows from the guild test, but she only pledged to fight 3 hounds, so eh... at least she got to show off her improvement to Elna.
Wow, it's a surprise there's none of the usual in-story fussing about underage drinking with Ria, since I tend to see useless details like that in other fantasies that aren't even set in Japan. All 3 of them had a mug of ale no problem. No drunken shenanigans either. Good, no need to bring Japanese laws into a setting that isn't in Japan and has no Japanese characters.
Him remembering the galactic war being waged for humanity's survival ties into him becoming party leader, so now he has a direction to work towards: preparing the people of that world, or at least his allies for a possible alien invasion. He really doesn't have much choice since escape from the planet is not an option, and the alternative would be for him to fight off the invasion on his own. He might be OP, but he's also mortal so the bugs can still beat him with enough numbers and enough injuries on him.