Toujuushi (Bestialious) (闘獣士(ベスティアリウス), Tōjūshi (Besutiariusu)) is a Japanese manga series written and illustrated by Masasumi Kakizaki.
Toujuushi Bestialious originally began as 2-part one-shot published in the Issue 2011-11 & 2011-12 of Weekly Shonen Sunday in February 2011. Later in July 2013, around 2 months after Kakizaki finished his last work, an announced revealed that Kakizaki will turn Toujuushi Bestialious into a series in Weekly Shonen Sunday starting from Issue 2013-36-37 in August.
A.D 70 The mightiest empire Rome started conquering the world. The whole Europe was havocked by Roman's foot. In Ablion, in order to protect their homeland, the Bravest Wyvern fought a bloody battle against the invader...