Let’s be honest: Yakyuken Special is not a good game. It is a relic of the 90s "Adult PC Engine/PS1" era where the novelty of digital photography was enough to sell a disc. The models are pixelated, the rock-paper-scissors AI is rigged, and the loading times are brutal.
Are you trying to link it to a account?
As of this writing, there is for the verified Disc 2 ISO on mainstream archive sites like Archive.org. The file is considered “endangered” in the preservation community. Your best bet is to join a private retro gaming forum (e.g., Obscure Gamers, PSX-Place) and request access to their dump. Yakyuken Special Ps1 Disc 2 Iso
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