Ikigami & Donor

Yuki Yoshino, a junior high school teacher, is informed that he's an "Ikigami donor." Ikigami are the strongest military-operated human beings, and the treatment for these super humans requires body fluids from their unique donor. As Yoshino is about to learn what it means to be an Ikigami donor, Kido storms into the room and demands for his donor. Kido, a super famous Ikigami, is told that Yoshino is his donor and Kido orders Yoshino to treat his open leg wound with his saliva. In disbelief, Kido and Yoshino both witness the leg wound heals in front of their eyes.

Note: Includes one extra chapter.