Synopsis
Renzaburou Taki seems like an ordinary office worker, but he actually belongs to the Black Guards, a covert group dedicated to preserving the delicate balance between humanity and the demon world. With the deadline for renewing the peace treaty nearing, Taki is assigned to protect Giuseppe Mayart, a vital human mystic, alongside Makie, a female demon. This mission proves far more challenging than anticipated; while a radical group of demons resorts to terrorism to shatter the alliance between the two realms, Giuseppe is solely focused on escaping his duties to pursue romantic encounters with women.