In the midst of Shouwa era Japan, greed runs rampant through the bustling cities and communities of the nation. King of Hell Enma Daiou summons an envoy into his office in the form of a small boy named Kurayami Santa. Through Enma's debriefing, Santa learns that the amount of greed and selfish behavior produced by humans will soon create an enormous wave of souls entering into Hell simultaneously, which would be catastrophic for Hell itself.
Santa is given one mission: do something about it. With neither guidelines nor rules, Santa is tasked to handle the situation as he sees fit. In the human world, a rampaging thunderstorm strikes a nearby cemetery with a bolt of lightning, and the envoy of Hell appears.
Teleported into the human world, Santa quickly realizes that humans are just as wicked as Enma had described. Without upsetting the balance between light and dark, Santa begins his quest to complete the mission from Hell and restore order to the human world.
Enoshima Island, Shonan, where a lot of garbage has washed up through the river and sewage system. This negative energy gives birth to the powerful "Trash Monster: Mad Trasher," who begins to attack mankind! Around the same time, a young man who loves the ocean discovers a mysterious stone during a beach cleanup…
A very different group of rabbits (humans) work together in a construction company which has the motto of "doing your best". They use this motto for everything, work your best, eat your best, play your best. They look out for each other and several stories are not related to construction, but to other experiences they have together.
Kyougoku Daijirou is the 15th generation owner of the Kyoto sweets shop Amashoudou. One day, Daijirou discovers a giant robot named Doamaiger D in his store's basement. At the same time, enemies called "Mekaijuu" appear in Kyoto and begin wreaking havoc.