The 1997 anime series was not subtitled or translated legally until 2002. I was not able to find fansubs back then.

The manga was not in English until 2003. I could not find translations into English until then.

I liked the game that came out on Dreamcast in 1999.

I do not remember these OVAs that came out before the 1997 anime. Please share more information, as I can’t find mention.

There were OVAs that came out years after the Dreamcast game.

But I’m fairly certain the game was the first Berserk thing in English.