It's a good manga but it just moved too fast and Nishi forgave ito to quickly

Yep. totally agree with you. The part where they were separated was too long compared with the rest, it left me unsatisfied. If only we could have seen more of their happy moments... But it was such a sudden heartbreak when Akira left Yuuki just like that. It was resolved too quickly, and then the end. Even if it was a "happy" ending the feeling was bittersweet