Han Yuseong's life was already a mess. Buried in debt and scraping by day to day, the last thing he expected was to awaken the world's only EX-class summoning ability.

Unfortunately, his summons aren't normal.

Half asleep, he accidentally burns a priceless summon ticket and calls forth Yeonbi, an arrogant eight-tailed fox capable of wiping out an entire dungeon floor with a single attack. From there, things only get stranger. A ghost who wants to quit haunting people, a vampire asking politely for blood, and a fox spirit more interested in having her tail brushed than following orders... every summon is a legendary anomaly with a personality as dangerous as their power.

As news spreads of an unknown summoner clearing Towers with impossible ease, hunters, guilds, and online communities scramble to uncover his identity. Meanwhile, Yuseong has a far more pressing problem:

How is he supposed to manage a growing household of calamity-class supernatural beings who are all a little too attached to him?