Chara Injector is a trainer game. To protect the Earth from countless threats, the Defenders need superpowers. As an injector at the newest injection center, your job is to inject the trainees and give them superpowers.
When you arrive at the center, you learn that this whole injection process revolves around sex. Your job is to steal sexual energy from the monster girls to give to the trainees. However, there is one "big" problem: you are well endowed. Will this be a problem for pure and innocent trainees?