Dungeon the Station

Upon the declaration by a mysterious figure who called themselves the Initiator, Shinjuku station was suddenly turned into a huge bottomless labyrinth. From there appeared dangerous monster known as Guardians. The government immediately established an organization for the clearing of the station labyrinth, but those who gathered there were all people with strange quirks. The strongest murderous Saintess, an always sleepy young witch, a former savior of the world gangster who fights barefisted, an enigmatic item-collector. And now, a young man who searches for his missing sister joins the fray. But, the station labyrinth holds a great secret. Their adventures in Shinjuku station starts now. Source: LINE