Feluria and Yako were not always the inseparable duo you see today. They both seem to have the same care-free, whimsical attitude about the world.
Yako had always been a prankster, travelling from his favorite fields to create mischief in the nearby sleepy villages. When he judged the time was right, Yako would pull pranks and make it seem like an unsuspecting villager had been the one to pull them.
Shelves full of many different concoctions fell into the well, from which erupted an angry water elemental! Polluted by the potions, the once benevolent elemental water elemental demanded the one responsible to come forward and face judgement or it would destroy the whole village.
The sentence for polluting a water spirit was death and Yako knew this. He was fine with people taking the fall for petty pranks but letting someone die from his tom-foolery was out of the question. As Yako stood there ready to accept his fate, a fairy appeared and petitioned to be his guardian!
Whether moved by Yako's gesture or Feluria's plea it remains unknown. The elemental allowed Yako to live but only as long as they were bound as mistress and familiar. Ever since that fateful day Feluria and Yako have been inseparable, though sometimes only by force of the magical bond set upon them.