I Was Possessed by the Mad Lady's Body That I Served The Duchess Goes Crazy Once a Day 公爵小姐每天疯一次 虐げられたメイドは病弱令嬢と入れ替わって復讐します 주인으로 모시던 미치광이 귀족 영애의 몸에 빙의하다
I believe that in this case the anime is better than the manga. Now here me out. the manga just skips the part from the bottom of the dungeon after they conquer to taking away from us a good resting place to introduce the history in a natural extended lore dump. It also gives us the time to build up the relationship the 2 have as they overcome the awkwardness in the relationship for this complete virgin who is made as edgy as a sword through his experience but was still shown to be awkward in his relationship with Yue. The pause also helps explain some of his new powers and shows him building the vehicles and some of the weapons, instead he but pulls shit out of his ass in the manga whenever he needs it. Arifureta knows it edgy as fuck, but they embrace it and make fun of him for it while explaining that this is just the result of him being and Otaku in an extreme environment that forced him to harden himself in one of the only ways he knew how while having a weebs fashion sense.