Release in 1989
A Retelling of the prison arc of the manga RIKI-OH! The story follows Saiga Riki-Oh, a young man blessed with inhuman strength. After taking revenge against a yakuza boss who was responsible for the death of his girlfriend, he ends up in a maximum security prison owned by a private organization. The prison is divided into four blocks, each run by a member of prisoners known as the Gang of Four. The first member is a tattooed knife wielder known as Hai that runs his block in a mafia style family system. The second member is a giant man (known as Tarzan in the live action) with incredible strength. The third member is a effeminate fighter named Huang Chaun that is growing Opium in the prison. The final member is a small man that use sewing needles as his weapons.
OVA
After his parents died, Mowgli is raised by the Wolf Pack of the Seeonee Forest led by Akela and other wild animals such as Bagheera and Baloo. The young boy goes through several heartwarming, bittersweet, and life-threatening adventures as he seeks after his true purpose in life. And one of many dangers he has to face is the man-eating tiger, Shere Khan...
TV Series
An innocent young man, Ikuroo, has a parasite known as Baoh implanted in his brain by an evil organization, Doress. The parasite makes him nearly immortal and gives him the ability to transform into a really powerful beastie when he's in trouble. Doress intends to use him in some sort of ploy for financial success, world domination, or something along those lines, but when they're transporting him on a train, a young psychic girl, Sumire (who's being held by the organization due to her abilities), sets him free and the two escape together. Of course, Dr. Kasuminome is the mad scientist behind the whole Baoh thing, and he isn't about to let his test subject get away and he has considerable resources (including some superpowered lackeys, as well as a small army) at his disposal.
OVA
To all his schoolmates, Jin comes across as a hot-headed class clown from typically barging in late and sleeping the whole way through to always responding to any situation with reckless stupidity. The fact that he used to be the charismatic leader of a legendary biker gang has turned into an urban legend; however, after starting a rivalry with the captain of the school baseball team, he and two former members, become their star players. But it's not long before his past catches up to him...
OVA