The mystery of the Blue Night is finally revealed. Satan was looking for a body, so he went to and from as many people on the planet as he could. He needed a strong vessel, so of course the strong holy people that fight demons would be the best fit. I thought it was retaliation for trying to go after them and Yuri, but, this makes sense. He wanted a body so badly. Until he finally possessed the Paladin at the time. And then went to Shiro himself. But fortunately Shiro's body heals fast because of the experiments, so when he want to cut his throat to stop Satan, it didn't kill him. Shemihaza showing up helped too, but man.
And apparently the only reason Satan hasn't done anything ever since then was because both Mephisto, Lucifer, and the other lords promised him that they would provide him a vessel. So he's just been waiting for that in Gehenna and the thought of that is scary.
It looks like Todo killed his whole family, besides the ones who died in the Blue Night besides his daughter. And then there's the group with that one man with Shiemi from the last volume with some lady that shared her name, what's going on with that. That was also the same night when Lucifer decided what he was going to do.
If things had been different, Yuri and Shiro would be raising Rin and Yukio together. That's what they wanted at the end. Shiro even confessed his love to Yuri, but she died because she didn't get proper treatment.
Shiro basically got stuck raising Rin and Yukio because of the promise he made.
I like how even as a little baby, Rin was strong. His white hair went away as the time passed by.
I know that Yukio said that Shiro knew that Satan would try to possess him, but the fact that he kept talking and taunting the man for 15 years makes it so much worse.
But after seeing all of that, Rin decided to use the key Mephisto gave him to see Shiro one last time, it was just heartbreaking. After that, he decided that he should live for the people to gave up everything to keep him alive. to go and meet with Yukio again.