Misumaru Tamatsukuri is a god with the ability to make magatama. She makes magatama from ancient ores and Dragon Gems mined from the Rainbow Dragon Cave. It's also said that she made the Yin-Yang Orbs that pass from one maiden to the next at Hakurei Shrine. Supposedly, magatama are a type of magical item that can not only absorb the souls and abilities of living creatures but can also be used to glean information about one's opponents.

Tsukasa Kudamaki is a kuda-gitsune with the ability to slip into places where one's soul is weak. As the Great Tengu Megumu Iizunamaru's right hand, she maneuvers herself into various social circles. Her whispers of advice bring about fortune but ultimately end in destruction and chaos. Having been sent as a messenger to both the market god and the oomukade, Tsukasa may appear hard-working, but she's often at the heart of troublesome events.

The Rainbow Dragon Cave is where Dragon Gems are found. Dragon Gems are a precious resource used in the making of Ability Cards and were once the subject of investigation during a past incident. The depths of the cave are devoid of oxygen, making it highly dangerous for humans to enter. When Misumaru heard the Great Tengu and oomukade were mining Dragon Gems in the cave, she was shocked and headed there to investigate, as she couldn't believe the youkai were attempting to dig up the items of the gods. Ore of great power rests in the Rainbow Dragon Cave, but perhaps that's not all.

There was once a battle of bullets in the Rainbow Dragon Cave between the god capable of making magatama and a kuda-gitsune with a sly grin. The god had come to the cave to investigate when she stumbled upon the kuda-gitsune, who was clearly up to something. And with that, their battle began. One wished to use the precious resources of the cave for good, while the other sought only profit. Perhaps their clash was caused by their opposing goals, or maybe it was simply the kuda-gitsune's trouble-inducing nature, but there's no way of knowing.

In the dim dark of the Rainbow Dragon Cave, brightly colored bullets cascaded, forming rainbows of their own. The dueling pair launched their attacks and swiftly avoided being hit as the battle intensified. The Yin-Yang Balls that flew and the magatama adorning Misumaru's attire lit up in all colors of the rainbow. Tsukasa's white dress and the test tube in her hand glinted and shone as they reflected the light of the bullets. Their battle filled the empty darkness with rainbow-colored light. The fighting was so fierce it wouldn't have been a surprise if the oomukade stopped her digging and appeared before them.