Is that It? Come on!!!

I read a review about the end of this time travel romance... and to my surprise, the reviewer said it was the worse ending ever because there was no happily ever after. I was a 'doubting Thomas' and knew the reviewer was incorrect. So, I searched, and searched for anything to prove me right. Jom had to go back to the future, he had to. So... I bought the manga on Amazon. And I was right... Jom did travel back to the future. So, why did the writers change the ending of the book? Hell if I know? I say... Chapter 13 please......All in all... I couldn't wait to see this amazing BL time travel adventure!