tl;dr: A short manga that shows character growth in a broken relationship very well.

This manga is pretty short, being only two volumes, but it uses them incredibly well. The two main characters were really interesting and also felt like they had good chemistry, even though they really shouldn't be that way. Now by that I don't mean the standard story of two archetypes that shouldn't be getting along, though that's also somewhat the case, but rather their personalities just don't seem very compatible and their relationship was incredibly unhealthy. However, despite that, while it is certainly turbulent, there is somewhat of a calm peaceful feeling that is conveyed when they're together that just makes them being together feel incredibly right. Isobe undergoes a lot of development over the course of the manga, wherein he starts depressed without any real hopes for life and hatred for everything, but ultimately ends up overcoming all that, and ending on a heroic note. Koume was different, in that her problems seemed to be more related to her being self-centered and not honest with herself, which she does manage to overcome. However, despite all that, their relationship doesn't develop, or rather I suppose showing how and why it couldn't develop was how it developed. It felt fitting, incredibly emotionally impactful, and in context was a necessary end to their character arcs, so I can't say I was dissatisfied with it. However, it still made me really sad, and quite a bit more than I would expect for such a manga with only two volumes. This is mostly directed towards the second to last chapter however, as I felt the last chapter was entirely unnecessary, as it didn't really add anything, and furthermore softened the impact of the previous chapter. The art was pretty good to look at, but more importantly it along with the pacing definitely helped in terms of creating the right atmosphere and tone throughout, wherein I think this manga used what I call empty frames, where there's no dialogue or anything actually happening, really well.