The mafia organization [Loto Nero] is ruled by Guest as its boss.

Naturally, as a mafia boss, Guest has many enemies seeking their head, and Mayhem, Vulture, Grasp, and Belladonna are four particularly skilled assassins. Though they use different weapons, they all watch for a chance to take Guest's life.

...However.

For some reason, every single day, someone does something incredibly stupid, making it impossible to complete the kill.

After failing an assassination, they feel a bit awkward, lose their drive, and just end up loitering. They drink tea in Guest's office, bicker, take naps, and then try to kill Guest for real again the next day.

If any other assassins show up, they are the first to go and crush the competition. They don't even realize that instead of killing Guest, they are effectively acting as bodyguards.

This is the story of their idiotic daily lives.