Search Worlds Without End

This is the Masked Ballroom: a place where people revert to beasts, let go of reason, and revel in freedom and anonymity. Here, with the help of a "monster supplement," anyone can transform into beasts and do as they please. It's the only "government-approved slum," where people can forget the suffocating atmosphere of the surveillance state. It's in this city where Reiji, a young vampire and a real monster, alongside his werewolf partner Tsuki, take on the task of keeping the streets clean. They search for centaurs who have committed hit-and-runs and fight life-and-death battles against the urban legends that manifest. And a meeting with the "Medicine Witch" will change the fate of Reiji and his friends...

The Masquerade--where people can throw off the shackles of society, revert to animalistic behavior, and revel in freedom and anonymity. In this government-designated slum, the pharmaceutical company Beast Tech distributes Monster Tonic, which transforms humans into Beastpeople. In a place so rife with violence and immorality, the cleaners from Fantastic Sweeper must clean up the mess... and any bodies. The vampire boy Reiji, the werewolf Getsu, and the new addition to their team, Kei work as cleaners. On behalf of their classmate Mei, they are tracking down the unstable Mythic Tonic which leaked from Beast Tech and resulted in the death of her friend. In the process, an unprecedented tragedy unfolds. And after the dust settles, the reported death count includes... three high school students.

The dangerous imitation tonic hits the market, spreading unprecedented mayhem throughout Natsukibara. Getsu and Reiji have been working hard to track down the mastermind behind the recent series of terrible events. But then, like a punch to the gut, their boss at Fantastic Sweeper orders them to halt their investigation! Though the boys don't want to comply, there is not much they can do when Beast Tech Headquarters gives the order. However, when news breaks that the CEO of Beast Tech is on their deathbed, desperation mounts. The CEO is the only one who knows the base recipe for the Monster Tonic, so the most likely successor is... Kei! The CEO's death could prompt magic users around the world to clash, bringing about the most horrific Walpurgisnacht. Will Getsu and Reiji be able to keep their friends safe?