The magical court, ruled entirely by girls, travels between planes year after year, suppressing the dark energy and shadows pouring through dimensional rifts.
The Moonlight-tier girls Wu Qian, Xing Luo, and Yue Tang are ordered to infiltrate Xingyu Middle School, posing as ordinary transfer students while secretly guarding the small city against dimensional threats.
Upon arriving in Xingyu, they find the whole city bathed in a gentle iris-purple glow that quietly dispels strands of darkness and calms hostility. The three assume it's merely a natural, lifeless radiance native to the plane.
Then dark energy builds up and runs rampant in the industrial district outside the city. Swarms of shadows launch an assault, and despite fighting with all their might, the three are trapped in a desperate situation, their defenses on the verge of collapse.
At the moment between life and death, countless iris-colored lights suddenly appear, wiping away all the darkness in an instant and saving them.
The three finally realize something is amiss. This glow has a will of its own and an instinct to protect life. It is no ordinary phenomenon, so they immediately report it to the court.
Qing Yan, a high-ranking girl inspector, arrives in person to investigate. She searches the city's rifts and exhausts every tracing spell, but still cannot find the source of the light. She can only classify it as a rare plane guardian spirit.
No one knows that the iris-colored glow silently protecting the city was never born of Heaven and Earth.
Lin Yan was originally a boy, but the instant he awakened the power of the Iris Guardian, his body transformed into a girl's. Now he hides among the ordinary students on campus, silently protecting this small city.
Amid their peaceful school days, the three stationed envoys spend every day together, relying on one another as an affectionate bond quietly takes root. They remain determined to discover the source of the glow, never suspecting their ordinary classmate beside them.
