Maricha is the idol of a stray family. One day a human came and challenge Maricha to a "game of happiness" which is to prove if Maricha is the most happiness yukkuri in the world. Maricha begin to brag about it's cardbroad house, straw bed and easy meal, but the human counter it by showing a video about pet yukkuri which include a huge house, fluffy bed and sweet-sweet. Maricha then brag about she is loved by it's parent, but the human ask the parent to trade Maricha for a bag of candy, which they agreed.
Maricha is heart-broken by this, but the human said the game is still not over and if Maricha win , he will return it to the family along with more sweet-sweet. It's parent quickly encourage their child to agreed and Maricha proudly accept. The human pull out a tube lighter and stuck it into Maricha's anaryu then light it. Maricha squirming in pain, she tried to scream but the human quickly stuff it mouth with an orange candy, which heal it's burning wound. Seeing Maricha , the parents begin to worry but the human explain that she is just show happy she is thru dancing and she is winning the game. The parent begin to cheer in joy while Maricha inside is burning and her anaryu is slowy expanding.
After a while the human declare Maricha is indeed the most happiness yukkuri in the world. He then return a fainting Maricha to it's parents and told them Maricha must be tired after working so hard, so he will give them extra sweet-sweet. The parent rejoy, praising Maricha while insluting the human for being too dumb to challenge their child.
Maricha wake up at night seeing it's parent is currently munching sweet-sweet. Remember that they sell her to be abused for sweet-sweet, it try to yell at them for being shitty parent but was too weak to do it. Maricha's parent notice their child wake up, hurried to Maricha and begin to praising her for defeating the shitty human and bringing many sweet-sweet.
Hearing that, Maricha quickly forget about the hurbish and become smug again, demanding a candy. But for some reason, Maricha cannot eat it. It's parent assume it still to tired and begin chewing the candy then feed it to Maricha. Still it cannot eat the sweet , as if the meal cannot enter it's body.
Turn out most of her paste in the back has been harden thru constant burning and the orange candy healing it, completly block all food from enter Maricha body. On top of that, her anaryu is expanding so much that water is leaking out of it. Maricha became weaker as day pass by and her parent has no idea how to cure it. Then, the human, with his lighter, came back to check on the family....