I can totally see the ax, but surprisingly i am not angry.
I do want this to have more, there are many plot point that still has potential and needed solving, but it just feels more... real this way, life isnt a story there is not really end besides death and even then some stories have repercussions, this feels like they did the first real step and there will be many more to come.
But like i said i still wanted more of this, but this clearly is a little too brainy of a story for the general public and even its specific public may have found some difficulties as it didn't have really real fights (well at least not many).
But Takayama entering the photo, in the end, is just so perfect and i am happy that he didn't just transcend humanity completely and returned to hs grampa, he has an entire life to make that decision so he can wait a little more and stay with those he loves.