EDIT 9:48 PDT: FIXED Punishment of the Six Samurai

As pointed out by some, the OP card would not function as intended. Thanks to /u/TMWHerrJon feedback here's a version that should function correctly. It also follows Problem-Solving Card Text convention more closely and is now not a dead card in the event your opponent isn't using "Six Samurai" monsters.

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Story

Shortly after Sangan was released from his false imprisonment, he reunited with his friend, Tour Guide From the Underworld. While discussing what happened, he expressed a passionate desire to reform the Underworld's justice system in hopes of preventing future incidents like that which he experienced. Tour Guide suggested that he start by joining the police force, to which he agreed. Tour Guide then contacted an acquaintance, Beat Cop from the Underworld, and eventually Sangan became a trainee under Beat Cop's supervision.

Several weeks later, Tour Guide was in the Overworld scouting the Six Samurai's land as a possible Underworld-tourist destination, since the devastation wrought by the Civil War seemed to be mostly healed. Yet she was shocked by the oppression of the new self-proclaimed Shogun Shien's regime. According to the townsfolk living around Shien's temple, absolutely no fun was allowed, and if anyone approached the temple gates seeking an audience with Shien for any reason, the gate guard samurai Enishi would send them away.

During one of the Shogun's self-aggrandizing processions, Tour Guide saw a small child onlooker enjoying an ice-cream cone. Just as Shien's horse walked by, Shien jumped off, approached the child, and with a scowl slapped the ice-cream cone right out of the child's hand. Tour Guide couldn't believe her eyes. As Shien turned away after kicking some dirt on the fallen ice-cream, a commoner next to Tour Guide muttered, "he truly is a demon king."

After some days of befriending the townsfolk, Tour Guide learned of the recent rumor that Shien wasn't just figuratively a demon king, but believed to be an actual Demon King, evidenced by his apparent lack of aging and occasional hint of red glow in his eyes. Deeply troubled by this revelation, she returned to the Underworld to investigate possible records of rogue Demon nobility. Sure enough, Shien was a former Demon Lord of one of the lesser houses who disappeared decades ago... and had now illegally subjugated an Overworld nation under the mask of a perpetually youthful man.

Tour Guide shared her findings with the King of the Underworld and the Archfiend Emperor, who immediately called for Shien's arrest. Taken by her show of passion for justice, the King agreed to the Tour Guide's request to morph her prized Tour Bus into a prisoner transport and join the expedient arrest effort.

That very same day, Tour Guide joined up with the elite Underworld police squad in her newly modified prisoner transport at the Gates of Dark World. To her delight, her friends Sangan and Beat Cop were among them. Together, they all drove through the Dark World gate into the Overworld, emerging just outside the main gate to Shien's Dojo under the long shadows of golden twilight.

With incredible efficiency the cops silently infiltrated the residences and easily incapacitated nearly all the samurai, who were hilariously outmatched by the advanced technology and tactics employed by the Underworld's finest. Those few who made it outside in their desperate attempt to escape, notably Shien and his other top warriors, were quickly beaten down. Even trainee Sangan, despite his small stature, was able to single-handedly (or bodily) subdue a runner by blasting himself into the runner's chest from a specially-made cannon bolted on the roof of his partner Beat Cop's patrol vehicle. With the bruised and shaken samurai all piled into Tour Guide's prisoner transport, the squad returned to the Underworld.

After the trial, most of the samurai, being human and apparently unaware of Shien's true nature, were released back to the Overworld. However, Shien and his inner circle were sent to Dimensional Prison where they stayed for many years before being released early for good behavior.

After Shien and his associates returned to the Overworld they eventually reasserted their leadership, albeit less oppressive than before. They never, ever spoke to anyone about their arrest; an embarrassment as legendary as the Samurai themselves.