Despite his wife, child, and mundane job as a salary man in Tokyo's contemporary society, Oji Tanaka's life was anything but uneventful. 15 years ago, he went by the name "Gabriel" and led a brief but famed heavy metal group called Black Heaven. When a mysterious blonde woman named Layla summons him to reclaim his Gibson Flying V and rouse his "legendary" guitar prowess, Oji's life takes a sudden turn. What he is unaware of is that his music fuels a destructive weapon in an intergalactic conflict.