The Demon Blade Detective

Protagonist: Shangguan Qianqiu. I don't have a System, but my growth potential and my dog-like womb are my greatest assets. And I'm a person, not a cold-blooded animal or someone who thinks with nothing but his lower half.

[Another World + Adventure + Combat + Mystery-Solving + Female Lead + A Protagonist With Brains + Demon Blades]

Soul-Eating Blood Demon: Unmatched staying power and absolute dominance.

Snow Maiden: The ultimate in push and pull, and elegance.

Thunder Slash: Soul Resonance: High defense-piercing and high damage. One slash is your limit, not mine.

Snake-Blade Sword: Oh, you've reached the execution threshold.

Maybe this isn't a power fantasy, but it fulfills all your fantasies about another world.