Zero Frequency

Rokka Lissen is the best sound engineer in the world. It can hear wrong breaths in a song, find cracks in records and make ordinary sounds sound perfect. But on the night of his biggest concert, he died saving a singer from an accident.

When he opened his eyes, Lissen had been reborn as Seha Kuren, a poor child in the fantasy world named Harmonia.

In that world, all power comes from Note—energy which vibrates within the human body. The nobles measured strength by the hardness of Note. Academia teaches that certain tones are born to lead, while others only deserve submission.

Seha is considered untalented because her Note capacity is almost non-existent.

They don't know that it can hear something no one has ever understood: the hidden frequencies behind each Note.

With the ability of a sound engineer, Seha will change how the world uses magic. But the further she delves into the strange voice calling her from behind the Quiet Zone, it becomes clear that her reincarnation is no accident.

There's someone who is rearranging the First Tone.

And Seha's voice may be the last piece they need.

- Sound, frequency, resonance and distortion based power systems.

- The protagonist wins through observation, precision, creativity and cooperation rather than raw power.

- The mystery of reincarnation that is directly connected to the history of the world.

- A fight that has both technical logic and emotional consequences.

- The relationship between sound and silence as the core of character development.