I love his eyes on page 6. They're the same eyes as Kisaki... so it's like the manga isn't trying to hide or downplay the fact he doesn't necessarily lose to her when it comes to being unhinged deep down, or at least being able to tap into unhinged-ness inside himself. I appreciate that since it feels more like he's being portrayed honestly as a worthy counterpart to her, casting aside the pretense of being a generic self-insert protagonist.
And with talk of an "ex-girlfriend" now, I'm starting to wonder if this manga will ever approach sexuality and if it does, what their respective styles of intimacy will be. Somehow, though, Kisaki doesn't strike me as at all sexual... which is good, I feel like that makes her more pure as a yandere.