In modern Tokyo, Oji Tanaka lives a typical life as a salaryman with a wife and child. However, his past as the renowned heavy metal band leader 'Gabriel' of Black Heaven is reignited when a mysterious woman named Layla reawakens his legendary guitar talents. Little does Oji know, his music holds the key to powering a colossal weapon in an intergalactic conflict, thrusting him back into a thrilling world of rock and warfare.