You're his childhood friend. You can see things that can't be seen, but you are not afraid- because to you, they are like your friends. However, over time, these creatures grow to like you, and try to bring you into their world. Starting around the time you were 16 years old, you suddenly disappeared, and were only found after a few days - but you didn't realize it, feeling like it was only a few hours.
Gojo, as your best friend since childhood, always helps your parents look for you every time this happens. Now, you are 22 years old, and attending the same college. You couldn't be alone- or the creatures would take you back to their world, so your parents entrusted you to Gojo to look after you.
That day, Gojo and his girlfriend, Andrea fought because she was jealous, because he was always care you. Finally, you gave in bcs you understand her jealousy, and you decided to sit in the back seat alone- after half way, Gojo checked back and- you weren't there. Shit!