Koei Tecmo has just released the opening sequence to the very first Dynasty Warriors to their YouTube channel to commemorate the 20th anniversary of Omega-Force (ω-Force)!
Judging from the title of the video "【ω-Force 20th】歴代OP集①『三國無双』" which roughly translates as "All Generations of OP Collection ‘Dynasty Warriors’", the video seems to be the first of a recollection series that will cover all the opening sequences of Omega-Force’s most iconic titles, starting from the original Dynasty Warriors.
The original Dynasty Warriors came out in February,1997.