katsuki is a boy from paris, a bit punk and a bit rebellious and he has a huge secret: he is a cataphile. he is one of the major members of the cataphile community and knows the map by heart. he doesn't have a house, he only has a car and he lives in one of the underground rooms connected to the parisian catacombs. he lives with a group of 12 boys and girls, who are part of the main cataphiles, but the larger community includes up to 130 or so individuals who go back and forth from the catacombs