This is a touching story. That's about all there is to say.
It reminds me of how a D&D game would be after it ends. Seeing the sights before letting your characters go. Memories that wouldn't be relived. Bittersweet.
Some people are over here like "There's too much fan service" And "This is too bland" and I am over here becoming the superhero "Blandman: The man that likes fanservice" Because I freaking love manga like this.