Reincarnated into a World Filled with Dungeons, But My Blessing Turned Out to Be the Most Challenging Dungeon

One day, I was hit by a car and ended my boring life. However, the next time I woke up, I was reborn in another world, and while undergoing a ceremony to receive a boon at the age of 15, the memories of my previous life came back to me. The benefit I got there was an off-the-chart skill that allowed me to open a space for one person to enter, but it was actually a benefit that allowed me to create my own dungeon, and I found myself gaining various abilities and becoming the most powerful person in the world. ……