Legend of the Dragon Kings [Anime OVA Series]  (1991)

Theatrical Release Information:
Legend of the Dragon Kings [Anime OVA Series]

The four Ryudo brothers may seem on the surface like four average, modern-day guys, but what lies within each of them is a truly ancient power. They are descendants of the Dragon Kings and they happen to be of the 117th generation, meaning that they will be imbued with the ancestral powers that have slept within their family for years. The brothers physically transform into dragons when they are angered, reflective of sacred abilities but upsetting to figures of authority. Now the Ryudo brothers are on the run from everyone who wants to harness the Dragon King power for their own ends, but the brothers can't run forever; at some point they'll have to stop and fight. ~ Cammila Albertson, All Movie Guide