Due to a translation error on the playbill, the Sailor Senshi mount a full-out assault on a Metallica concert in Tokyo... at the same time Nephrite shows up to seize the "Metallic Crystals" the band members must obviously have. The ensuing Metalocalypse (see what I did there?) amounts to a mashup of Sailor Moon with Brutal Legend (with maybe a bit of "Legend of Black Heaven" (aka "Kacho O-ji")) on the side.
Also, the Royal Lunar Hairstyle turns out to be Really Good for headbanging in the mosh pit.
Also, the Royal Lunar Hairstyle turns out to be Really Good for headbanging in the mosh pit.