Thanks for the translation! Grateful that you all translated the extra chapter as well, which really seals the tone of the story for me.
Was the novel chapter included as part of the official release or was that added by the team?
The extra chapter release was part of the official manga volume release. I assume it was also written by Ru, however I did not find it in their novel works on pixiv. The manga covers the original novel written by Ru which is all from Yumimaru's POV, but the manga also seems to incorporate parts of the separate prequel from Konno's POV into chapter 8.
Both characters have struggled with the experience of not being seen as the human beings they are while having lived in this city. And having lived devoid of meaningful human connection, they both take turns fumbling with this relationship they build together. Like Yunimaru, when she was given the necklace by Konno. And Konno with her desire to hurt Yunimaru with her death. Konno who seems to have failed to been seen as a human being during her life so far, seeming to throw things at the wall and hoping something would stick, in an attempt to continue to live.
The ultimately hopeful ending is still bittersweet in that aspect, I hope these two can continue to build upon their relationship and recover from the ennui they have experienced.