Ragnarok

Ragnarok was led by Keizo Arashi.

Background
It is known that this gang was in confrontation with Kodo Rengo, the gang that was led by Wakasa Imaushi.

Before the first gen. of Black Dragon happened, these two divided the Kantou region.

The gang had about 600 members at the time of its existence, and was considered the largest gang in Japan.