Wow, the end of that volume screwed me up, big time. We've been getting big hints that something is definitely wrong with Yuki. Obviously he has powers derived from Satan that seem to have laid dormant until now from what we've seen. I do like heroes turned villains to antihero stories, but I love the brotherly dynamic between Yuki and Rin so much that seeing this happen really hurts. I'm especially curious about what the hell Yuki saw on that USB Lewin gave him. It has him wanting to alienate himself from everyone and completely question his worldview, so it must be bad. I can already see how much Rin is going to suffer after this. He loves his brother and he's the only family he has left, so it will be hard to lose him. I hope Yuki gets some kind of redemption arc at some point in the series. I trust Kazue Kato to develop the story well for Yuki. I've already seen in the past how these stories can go wrong. (I'm talking to you Sasuke Uchiha!) I trust Kato to do a better job, though. I'm looking forward to find out more next volume.