Oji Tanaka has a wife, a child and a routine job as a salaryman in Tokyo"s contemporary society. Yet his past was anything but ordinary; fifteen years ago he went by the name "Gabriel" and led a brief heavy‑metal band called Black Heaven. Oji"s quiet life takes an unexpected turn when a mysterious blonde woman named Layla invites him to retrieve his Gibson Flying V and once again demonstrate his legendary guitar skill, unaware that the music he plays powers a massive weapon in an intergalactic war that spans countless galaxies for humanity.