HItman 10 is a gag manga about the top ten hitman fighting each other to become number one and receive a billionaire's prize. The main character is one of these hitmen.
After Ashirogi Muto's editor Goro Miura suggested that they do a gag manga series, Mashiro and Takagi reluctantly agreed to do the series while secretly creating another Manga Future Watch. Both competed against each other for serialization but both were unsuccessful.
The plot of this manga is somewhat similar to the videogame No More Heroes.
The main character looks similar to Akito Takagi.