In this realm circulates a legend about an immortal Green Dragon, whose scales are Emerald Green. No one gives much credence to what is told by the few who are able to speak. For they were all found in a pitiful state, with no memory of what happened and smelling of alcohol. A few are able to recall a Green Dragon and insist that the Dragon has a name they are unable to remember.

The visitors from another world, driven by curiosity and recklessness, set out on an adventure in search of the aforementioned Dragon. But they all end up with the same fate, with no memory of what happened. These people seem to be even crazier than the people of the Kingdom itself, as most of them insist on their quest for the Emerald Green Dragon, but what is most surprising is that with each "new encounter", these people seem to grow stronger.