Time travel + unique training + single female protagonist + non-harem!
I traveled through time and became a fantasy loser, and my engagement was broken off by a genius girl.
>The whole city is laughing at me because I want to eat swan meat.
>She doesn't know that I have the entire modern scientific system in my head.
>When she threw the marriage certificate in my face, I backhand detonated the nitroglycerin in the basement.
>"Break off the engagement? Are you worthy?"
>In the smoke, I pinched her chin: "Remember, I am the one who broke off the engagement today, don't bother me again!"
>Many years later, I pointed to the galaxy with my single heroine sword, only to discover that the so-called fairy world is just a laboratory of advanced civilization.
