I read abut happy core, and I think that there is a few songs that could fit into them. This one is through the eyes of my oc Dust. He's a bit of a wayward child in this story. But this story is about him moving on after Saki's death. Because in this AU, Dust was a homeless neko, but he found Saki. And he hung out with her, and well. The two of them dated. And then the assault happened. 

There is a lot of mixed emotions, due to the fact I felt different emotions while reading 177103. So, here is the story, enjoy..