Mature (some violence and spice)
The Yoshikawa-gumi is one of the most infamous mafia groups there is. They have the highest traffic for the black market and it's as if no other group can even put a dent in them. What makes them so strong and unstoppable? To find the secret to defeat them, the government decides to send someone to go undercover and gain the trust of the Yoshikawa-gumi and find out just how to destroy them from within. Will it work out, or will something else come from this?