It has been decades since labyrinths first appeared in the modern world of Japan, bringing with them monsters and related catastrophes. With this brought many changes; the biggest one being a new profession called 'Adventurer' and the monster cards they use to summon their own monsters to fight and conquer labyrinths with. Kitagawa Utamaro, nickname Maro, is a mob highschooler who becomes an adventurer due to being…