Mukoubuchi - Kou Rate Ura-Mahjong Retsuden summary: The decade known as the 1980s proved to be an exceptional period. Land prices rose to incredible heights, and the value of currency surged beyond customary levels. The world's defining figures were all in a state of turbulence, leading to an enormous bubble economy that Japan had never witnessed before. In the realm of Mahjong, this era marked an unprecedented scale of high stake games. It was during this time that a man referred to as "Kai" existed as a "Mukoubuchi," equivalent to a solitary and uncompromising gambler.