Great story, but it's the kind of end that nothings happens. It just restored to how it was.
I also don't understand the Sorcerer character, he hated the world alright he wanted destruction. So why did he fucked with Yato when he realised he can't be changed, what was the point of killing Hiyori?
If the Mother really did that she's achieved biggest wuss award. That's no mother, it won't even be an issue if she didn't hand the letter back to dad. She indirectly led to more suffering and eventual death.
Yato's dad isn't talk about much considering this good of the evil character he's playing. He's powerful, uses people insecurities and weakness to win and use them. Should be in the list of great villains.
It was going that way, hope Yukine finds peace and correct path.