At the climax of the chant, they play a standard hand of Jan-ken (Rock-Paper-Scissors). The loser of the round must remove one article of clothing.
The PS1 port is notorious for being an "unlicensed" release, often associated with a wave of adult-themed games that found their way onto the platform outside of Sony's strict licensing control. Yakyuken Special Ps1 Iso
An ISO is a digital backup of a game disc. At the climax of the chant, they play
If you’ve ever delved into the deep, dark corners of 32-bit imports, you’ve likely stumbled upon a title that feels more like a fever dream than a video game. Enter The Yakyuuken Special: Konya wa 12-kaisen!! An ISO is a digital backup of a game disc
Because the game was never localized for Western markets (obvious reasons regarding content ratings), the only way to experience it today is via the original Japanese disc or its ripped .