A while ago on some random board (forgot which) on 4chan I saw this guy reply to something and the pic was kind of irrelevant but very interesting. It was part of a manga that looked really interesting and I remember wanting to read it when I searched it up. But now I forgot the exact quote on the manga (therefore I cannot search it again).

What I saw consisted of a girl kneeling down (with tears?) to a boy saying something like "we could have gotten married" or something like that. But here's the REALLY interesting part, the guy just looks at her apathetically in one panel then SLICES HER HEAD RIGHT OFF. Then the other panel says "LEVEL UP" like a video game and im assuming he absorbed her power after killing her.

But anyways, I want to read this manga! Help me find it!