First of all, I watched in JP without sub and the girls never once called mc "lil bro", it's a mistranslation, complain about translators, they do shit ever since they licensed all anime. They call him "shounen" = young boy. the word is use from 8 to 18yo overall. Pretty enjoyable anime, cute girls, overpowered mc, that's what I was waiting for reading the synopsis. Don't be deceive by ecchi tag, it's more fan-service (and there's very few). Didn't see any romance or "sexual" scenes like I read in other review at all and i've seen 9 episodes. Animation is great, the Voids (enemies) are in CGIor 3D (I don't know) but are pretty clean even if it denote with the 2D art.

So, if you just want to chill without headache and looking at pretty girl with an overpowered MC (but not too much either), I recommend you. If you are searching for the next One Piece, this is probably not for you. The prologue was a bit on the long side for nothing in my opinion. Art is pretty.