Eternal Traveler: Starting from Being Summoned by a Girl

My name is Correa, and I have just traveled to a different world. The scenery here is very good, at least at high altitudes, but now my top priority is to find a way to survive at an altitude of 10,000 meters. I don't know why, but I was frightened and fainted as soon as I traveled through time. When I woke up, there was a super pretty lady looking at me! After hearing what happened to her, I thought I should protect her, well... How about in the name of a knight? We later escaped and came to a city known as "Destiny". After I came here, my soul seemed to have been reminding me of something, but my heartbeat seemed to be warning me that I should not go there. … When "destiny" is regarded as the supreme concept, an existence outside the script arrives quietly. It is regarded as the supreme existence, a sacred instrument, and an opportunity to change destiny...