He is Hibito and Honoka's grandfather. he hates Grapping and doesn't want Hibito to become a Major Grapper. this is because he was once a G-Con mechanic, before Hibito and Honoka were born. he was messing around with a new model of G-Con, and discovered it could draw in Dark Matter, a form of matter much more powerful and dangerous then regular matter. he tried selling them, but once he saw how they could make people go insane if used for too long he trashed all his models. but someone had found out about the Dark Matter Higoro had created and tried to reproduce it for the black market. it worked, and now Dark G-Cons are sold illegally all over the world.