I started out liking this, but it's turned into one of those stories where swishing and swooshing take the place of plot.
How hard would it be to use his owl for recon, rather than keeping the little sister company?
Also, using that monocular to figure out the skills should be a viable option. After all, he's seen several of the evil people use strange skills. At this time, it's clearly suicidal to go up against them, and unknown others without more information.
3rd, this manga is called this, shop, that, and the other - so where's him using the shop to get OP?
I also am not a fan of his behaving like an ass towards the childhood friend. And don't say trauma. That part is not impressively written.
I don't know if I'll continue reading this...