
If you're looking for manga similar to Don: Gokudou Suikoden, you might like these titles.
Aki Joji, a former yakuza who has a teaching license, was forced to teach at a high school by his "Kashira".
"A hero" is a job that in the face of danger and adversity or from a position of weakness, display courage and the will for self sacrifice. Would you like to work as such a hero in our company? You may transform, manipulate a huge robot or fight as a squad. Shall we realize your dream in our "Hero Company"?!
When an American scientist carrying a cure for the AIDS virus is kidnapped by an arms merchant, John Kyosuke is forced back from retirement. He accepts the challenge to regain posession of the anti-serum. He finds out that some of the people he is after are closely related, which gives his conquest a whole new meaning...
Absolute power corrupts in all ages and all administrations. This is a never-ending truth. The iron fist of graft in the velvet glove of government-run enterprise continues to expand the power of money-mad politicians and bureaucrats who abuse their authority, deceive the citizens, and line their pockets with financial kickbacks.The newly established Government Crime Investigation Agency (GCIA) vows to prosecute political corruption and uproot the evil that police and the courts have failed to find. The man given the ultimate authority to lead a cavalry against political corruption is government crime investigation agent Zaizen Joutarou!
Shinjuku, 1979. A member of the Kaeda Yakuza gang, Akutsu Jouji, has lost in a brawl with a university cheering squad, and begs for forgiveness through bitter tears. Since then, nothing has gone well in Jouji's life, until 10 years later in 1989, his friend was ordered to kill him, and as he ran away he killed himself, ending his miserable life.