Professor Souichi Tomoe's Right Eye

 

When Hotaru was little he took her to the Genetic Engineering Building with him to introduce a new machine. The building exploded and Tomoe was holding his dead daughter, this is also how the professor lost his right eye. The daimon (enemy) appeared asking if Tomoe wanted to save Hotaru life and his. If Tomoe wanted to save their lives he would have to agree to the daimon's conditions. The professor said that he wants to save his daughter's life and doesn't care about his own, so the daimon said that he would take over his body. Once the agreement was settled the daimon entered through the professor's right eye and took over his body. The building exploded again and Hotaru and the professor where the only survivors.