Just finished watching this
So, what the fuck is up to in the end with Goto and his gf, did he got a new one? did the old one reapear? he went back to his old habit?
Yeah, he got a new one alright.
Drama CD explains that the bus went through a dimensional rift and it reappears in the modern day.
He finally lets go of her after meeting her again and realizing she doesn't recognize him , and that he's grown too much in her absence to even THINK of dating her anymore.