Hiroyuki Yoshino
is a manga and anime series authored by Hiroyuki Yoshino featuring art by Kenetsu Satō. The series is notable for its violence, fan service, and the use of vital energy coming from women's breasts (referred to as "Soma") as a central plot device. The manga series was published in Japan in the manga magazine "Champion Red" from 2006 to 2016, and the chapters collected into 24 "tankōbon" volumes. A 24-episode anime television series was produced with the same title as the manga series and broadcast in Japan on Biglobe in 2010. An OVA adaptation titled was also produced and released on DVD with the manga series volume 10. A 12-episode second season was produced with the title and was broadcast in Japan between April and June, 2011.