12 Beast (トゥエルヴビースト, Tueruvu Bīsuto) is an ongoing Japanese action adventure seinen manga series written and illustrated by Okayado. It is published by Fujimi Shobo, and began serialization in the Age Premium magazine. When Age Premium was shut down, it transferred to Monthly Dragon Age. The chapters have been compiled into three tankōbon volumes as of August 2015. It is published in English by Seven Seas Entertainment.