Feeling a bit like Otome Game no Heroine de Saikyou Survival, Moto Ansatsusha, Tensei shita Kizoku no Reijou ni Narimashita. mainly centers on how an emotionally stunted reincarnated assassin deals with having a pacifist airhead of a mother and a manipulative idiot for an adoptive sister. Although it also eventually introduces subdued romance elements via a love triangle between her, the somewhat bloodthirsty slave boy she picks up during a mission, and a highly practical prince, which seem like they’re going to be the more long-term focus of the story.
Something like a cross between Free Life Fantasy Online and Overlord, Ougon no Keikenchi (English subtitle: The Queen of Destruction Speedruns Her Ascension) embodies its subtitle fairly well; this is absolutely a speedrun which at times lacks believability (why were endgame-level metal ingots available in the starting area?). Still ends up more entertaining than not though as long as you don’t mind a somewhat anti-social protagonist who mostly talks to themselves about game mechanics.