動物の姿に変身する特殊能力を代々受け継いでいるバンパイヤ一族。その研究に生涯を捧げている熱海教授の講演会場に、ひとりの青年が訪ねてきた。彼、トッペイは暴力沙汰に巻き込まれ、新聞記者の森村に助けられる。両親を探している、という彼に同情した森村は、当面の仕事場として手塚プロを紹介する。そんなトッペイをバンパイヤ族ではないかと疑った悪の天才、間久部六郎(ロック)は何とかトッペイの真実を暴こうと近づいてくる。
The Vampire tribe inherits, from generation to generation, the extraordinary ability to transform into animals. A young man comes to see Professor Atami, who has devoted his entire career to the study of the Vampire tribe. After becoming caught up in a violent incident, the young man named Toppei is rescued by the newsman Morimura. Sympathizing with Toppei, who is searching for his parents, Morimura introduces him to Tezuka Productions as a temporary place to work. Suspecting that Toppei may be a member of the Vampire tribe, the genius of evil, Makube Rokuro (or "Rock"), prevails upon him to reveal his identity.
