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After the climactic battle to decide the fate of humanity, the hero Max, alongside his party, emerges victorious against the formidable Demon Lord. As he draws his last breath, the defeated Maou vows to return more powerful than ever to take his revenge. Ten years later, although Maou has resurrected, the process is incomplete, resulting in him taking on the form of a child. Nevertheless, not wanting to waste another second, Maou pays his nemesis a visit—but the hero who once gallantly protected humankind from the demon's clutches is now a pitiful slob bearing no resemblance to a man of his former caliber. Despite his disappointment, Maou moves in with Max in hope of building him back up into a worthy adversary. But as the demon learns more about the events that transpired in the decade of his absence, he realizes that there is a story behind Max's downfall that he knows nothing of.

Fine and Rein are sent to the Royal Wonder Academy on the Royal Wonder Planet in order to study to become better princesses. They plan to make many friends, but unfortunately, the competition and cold nature of the students and teachers make things impossible. The twins also become Universal Princesses when touching the legendary Soleil Bell, releasing two angels named Pyupyu and Kyukyu to help aid them. Unfortunately, an evil force manifested in a painting doesn't seem to be satisfied about the Universal Princesses...

Wei Ran, a college graduate, was accidentally led into a world he never thought existed by a cat. When he was trying to find a way to return home, he learned that the only train that could take him back to the human world would only arrive in half a year. He could only temporarily live in the shop run by Mao Mao Yaya - Guaixiang Sale. Just when life seemed to be settling down, Wei Ran unexpectedly discovered that no matter where he went, dragon scales would appear. And every time the dragon scales appear, it causes completely different strange effects...