
Pt 1: I read the manga. Not too heavy on the fanservice if I recall in the manga. There was some though. Because he lives in a misandrist world where men have fewer rights he has to use his knowledge of the game he started into in order to obtain a lot of wealth as an adventurer. Otherwise his adoptive mother would marry him off in a political marriage to some rich fat bitch who keeps sending her husbands to die on the front lines because she thinks men are worthless.
Pt 2: so he risks his life, almost dies, and gets mad loot. His adoptive mother says, alright, you don’t have rights, hand it over. He says no, adventurers have rights, so I don’t have to. So he avoids political marriage, and buys his way into the academy because he wants to learn and quickly find someone to marry him so he can get far away from the world he hates without getting lonely. Only as a lesser nobleman and FOID equivalent of that world he is super chopped.