To the world, 17-year-old Izumi Aoi is a flawless, wealthy prodigy—and an utterly exhausting, cringe-inducing eccentric. But behind his loud boasts lies a soul saved from the brink of despair by "Moon," an underground midnight radio host who vanished three years ago. When a sudden school broadcast echoes with Moon’s exact voice, Izumi rushes to the source, only to find four distinct girls with the exact same vocal frequency. To find his savior, Izumi must change their lives.
Izumi Aoi has everything: striking good looks, sharp intelligence, and a prestigious family name. He also has a severe case of over-the-top, cringe-worthy self-confidence. He loudly boasts about the "Aoi" legacy and acts with an absurd, theatrical flair. However, this eccentric persona is a deliberate shield. At age 13, Izumi hit rock bottom and nearly gave up on life. He was saved by "Moon," an obscure, late-night radio broadcaster whose stream had virtually zero listeners—except for Izumi. For months, they shared deep, late-night conversations until Moon suddenly went off the air and vanished.
For three long years, Izumi has been searching for that voice. He refuses to coast on his family's wealth, living by a strict philosophy: Perfection is built through effort, not empty words. He vows to make his own fortune and find the girl who mended his broken soul.
As Izumi dedicates his blood, sweat, and tears to helping these four girls achieve their dreams, the lines begin to blur. Every girl has a reason to be Moon, a dark past hidden by a bright smile, and a growing affection for the absurd boy who refuses to let them fail.
Who is the real voice behind the moon? And what happens when Izumi realizes that in saving them, he might have to choose between the memory of his past and the reality of his future?