Biography of Catching Monsters

The mountain village where I lived when I was a child experienced huge changes, and eventually the village was deserted and turned into ruins. When I was nine years old, two weirdos came to the mountains, and their behavior was weird and exaggerated. Because I was frail and sick since I was a child, I never left home. When I was twelve years old, the two old people who raised me passed away one after another. I knew that I was not going to die soon, and I remembered that my two old men often said that the two weirdos were very capable, so I walked towards the mountains. Unexpectedly, those two weirdos actually cured my stubborn illness and taught me some skills. When I finished my studies and parted ways with the two weirdos and went down the mountain, I picked up a newborn black dog, and I have been living with this black dog ever since. Later, I met the legendary monster again, and then I realized that things were becoming more and more incredible, even more unbelievable...