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(Full-time hunter, prisoner of delicious food, under one person, fully learn from it.) Legend has it that there is a kind of seaweed. After it is dried, plump crystals will condense on the surface. The inside is full of rich and mellow sauce. When paired with crispy rice balls, when you bite into it, the sauce immediately splashes from the crystals and melts in your mouth. Legend has it that the unknown desert is inhabited by a strange species called the "Devil's Sand Ray". Once they leap out of the sand sea, their sun-blocking bodies will cover their prey like the devil's bat wings, leaving them with nowhere to escape. Legend has it that in some unknown corner of the world, there are ruins that have not yet been discovered by humans. There are hidden treasures collected by countless human ancestors throughout history. They lie underground, waiting for greedy people to discover them. One day in the future, there will be such a person. Legend has it that his knowledge is as vast as the ocean and his collections are as countless as the stars... Where is he, you ask? I heard he is still traveling.

The real doomsday is not the mindless zombies and the desolate earth, but the doomsday of mankind and the paradise of the whole earth!

My name is Isshin Miyamoto. The current leader of the Demon Slayer Squad is Naruhashira. On my first night in this world, I was attacked by a monster. An old man named Kuwashima Jigoro saved my life. Then he became my master. ... And now, I'm going to kill my junior brother...