Fantasy

I was on my way home with my friend when suddenly, I spotted a catgirl cosplayer who made my heart skip a beat.
    But something felt off—I couldn’t recall seeing her in any anime, manga, or games I had ever come across. Confused, I asked my friend standing next to me.
    To my shock, his response sent chills down my spine:
    “Huh? What catgirl? What are you talking about?”
    Suddenly, a truck came barreling toward the girl. Without thinking, I rushed to save her. In the end, both of us were hit by the truck.
    Now, I find myself reincarnated in another world—in the body of the very catgirl I had seen.
    But... who is this girl?
    How is she related to the dungeons that keep popping up in this new world?