Sirius (Kill la Kill OP1)

Eir Aoi's "Sirius," the first opening theme to 2013's berserk anime *Kill la Kill*, is a four-alarm fire of an anison track — a song that grabs you by the collar in its opening seconds and never lets go. Named for the brightest star in the sky, it matches the show's hyper-saturated, scissor-blade chaos with a relentless rock-pop charge: galloping double-time drums, slashing guitars, a synth line that sparkles even at full sprint, and the kind of soaring, wide-open chorus the genre lives for. Aoi's voice is the engine — bright, powerful, pitched at that anime-vocalist intensity that somehow stays clean and pretty while belting at the top of her range. There's steel in it, a heroine's resolve, perfectly mirroring protagonist Ryuko's fury. The lyrics trade in cosmic-scale determination: shining like the brightest star, cutting through despair, refusing to be extinguished — the standard anison vocabulary of defiance, but delivered with total conviction. Composed by the prolific Hiroyuki Sawano (under his frequent collaboration), it carries his signature grandiosity, big and cinematic without losing momentum. For fans it's inseparable from the show's manic energy and that unforgettable red-and-black aesthetic. Best experienced at full volume, ideally while the opening animation flickers in your memory. It's pure forward motion — adrenaline, starlight, and an unkillable will, compressed into ninety seconds of flight.