The original manga by novelist Takaya Kagami (The Legend of the Legendary Heroes, A Dark Rabbit Has Seven Lives), manga creator Daisuke Furuya, and manga artist Yamato Yamamoto takes place in a world where an unknown virus has killed the entire human population except for children. Those children were then enslaved by vampires. The manga centres on Yūichirō Hyakuya, a human who dreams of becoming strong enough to kill all vampires.
Daisuke Tokudo directed the series from scripts by Hiroshi Seko. Satoshi Kadowaki adapted the character designs. Wit Studio animated the series