A middle-aged salaryman's guitar riff becomes the only weapon that matters in an intergalactic war he never signed up for. The show treats his dusty Gibson and faded rock dreams as seriously as it treats saving the universe. Heavy metal isn't just the soundtrack here, it's the only language that actually works, and watching a burnt-out dad rediscover why he picked up a guitar in the first place hits harder than any alien invasion plot has the right to.

Ouji Tanaka lives the quiet life of a Tokyo salaryman with a wife, a kid, and a job that makes days blur together. Fifteen years ago, he was Gabriel, frontman of Black Heaven, a heavy metal band that did not last long. That past comes back when Layla, a mysterious blonde woman, invites him to take up his Gibson Flying V and show off his legendary guitar playing once more. What Ouji doesn't know is that his music isn't just noise: it supplies power to a massive weapon being used in an intergalactic war. The series mixes slice-of-life comedy and music with science fiction adventure, built around a man called back to who he used to be.