A virtual world was created by the present-day network called the "Digital World." The "Digital Monster," which is a digital life object, was born, and the host computer Yggdrasil managed the different Digital World areas. However, it developed the X Program of fear to eliminate all Digimon in the old world and develop a new Digital World for only certain Digimon... Now, the greatest crisis ever approaches the Digital World. The X-Digimon, a new type of Digital Monster, is hunted by the Royal Knights who protect the Digital Worlds. Their master, the network overseer Yggdrasil, seeks to set in motion Project Ark to renew the Digital Worlds and create new Digimon, but at the cost of all other digital life. This new X-Digimon will seek out the answers to its own existence as it tries to protect the life of all Digimon, and in the process it will change the Digital Worlds forever.

The power of beginnings, the energy of the core stone; one may find it good, one may find it evil. During a normal investigation, Yue Juntian finds himself drawn into the battle between the 'beginnings' of Yun City; Jiang Xin arrives in Yun City to stop Li Zunyuan's plan to take over. The two influence each other - one solves the mystery of their birth, the other redeems themselves. Together, they oppose Li Zunyuan.

The glittering spotlights. The sparkling, fluffy, cute outfits. The charming voices while dancing with bright smiles. Under the dazzling lights on the big city stage, these would be the mermaid idols who swim and dance freely underwater. But far from this big city, the girls once lived in the peaceful village of Parrel. These girls, who would not even imagine such a glittering future for themselves, are instead just raising a fuss over the snack cakes they are eating. This is the story of the cheerful daily life of mermaids who strive their hardest everyday.