In the year 2062, the world's two superpowers are fighting a long and brutal war. In a desperate attempt to win, pilot Kei Katsuragi is given the mission to detonate a super weapon called the Space/Time Oscillation Bomb. The bomb explodes but the results are completely unexpected: a multitude of dimensions, times, and realities are unleashed into the world. Can Kei reverse the effects and bring life back to normal?

Atsuko "Akko-chan" Kagami (known variously as "Stilly," "Caroline," or "Julie" in Western versions of the anime) is an energetic elementary school girl who has an affinity for mirrors. One day, her favorite mirror which was given to Akko by her mother (or in some versions, by her father, as a present from India) is broken, and she prefers to bury it in her yard rather than throw it to the trash can. In her dreams, she is contacted by a spirit (or in some cases the Queen of the Mirror Kingdom) who is moved that the little girl would treat the mirror so respectfully and not simply throw it away. Akko-chan is then given the gift of a magical mirror and taught an enchantment that will allow her to transform into anything she wishes.

Moments after an atomic bomb falls over Hiroshima, a secret Japanese submarine sails into battle against its American counterpart, and both are lost to history. Some fifty years later, a special UN task force sent to investigate unusual phenomena in Antarctica is threatened by a mysterious black cylinder.

Luo Yun, an orphan boy, has a mysterious background. When he became an adult, he was accidentally pulled into the "East China Sea Dragon Palace Chat Group". After exchanging cultivation secrets from the immortal friends in the group, his cultivation level increased greatly. Since then, he has transformed into "Luo Yuan Shangxian" and started his journey of cultivating immortals between the human and immortal worlds. Relying on the information gap and witty planning of the immortal friends in the WeChat group, Luo Yun exchanged spicy strips for immortal pills and cola for spiritual treasures, constantly improving himself, helping the weak and upholding justice in the real world. As the Overlord Seafood Company rose all the way in the two worlds, Luo Yun was involved in the great dispute between Peach Blossom Spring and Chaos Star Sea because of the mystery of his life experience.