Project ARMS, simply known in Japan as ARMS, is a Japanese manga series written by Kyoichi Nanatsuki and illustrated by Ryoji Minagawa. It was serialized in Shogakukan's Weekly Shōnen Sunday from March 1997 to April 2002, with its chapters collected in 22 tankōbon volumes. The story follows Ryo Takatsuki, Hayato Shingu, Takeshi Tomoe and Kei Kuruma, four teens who discover that their bodies have been genetically engineered. Despite their differences, they team up and search for answers, leading them to confront an organization called the Egrigori, responsible for the nanomachine technology implanted in their bodies.