Hokuto no Ken - Ryuken Gaiden(北斗の拳 リュウケン外伝) －THE JUDGEMENT DAY－ ; Hokuto no Ken Ryūken Gaiden THE JUDGEMENT DAY ; Ryuken’s Story: The Judgement Day

A oneshot story about Kenshiro's sifu Ryuken and also the other adoptive brothers. Elaborates on how he chose the Hokuto Shinken successor and the events related to it.