Because of their constant arguments, Komui ordered Allen and Kanda to stay at a current location after their mission for three days in hopes of two exorcists learning to get along. Now stuck in a casino resort, Allen adapts and makes money through poker while Kanda tries not to get too annoyed with Beansprout in their shared hotel room. With someone after them, what could go wrong?

What would happen if Nagisa does become a true assassin by the time he reaches his college year while Karma is living the life as an ordinary university student? Karma eventually loses his connection with Nagisa when they graduate from middle school. When he finally meets Nagisa after all these years, the first news that his friend gives is the fact that Karma is Nagisa's target.