<report>Literal fanfiction. However, it's not exactly bad quality, and it's still more Muramasa content.
Shokuzai-hen is just fanservice at the heart of it. We always want more Butei, Origa, Muramasa, Kanae, etc, and it swiftly delivers there. The Akitaka-centric narration may not be the most exciting stuff, but this is a rare view into the chaotic world in Muramasa from a normal person's point of view. A pity it's not voiced.
Don't mind the low rating, I'm just sad we never got an expansion to Chachamaru end, or more Chachamaru in general. If you're a Muramasa fanatic and you've tracked this down to read, by all means go ahead. It won't ruin your current experience, but it also doesn't quite enrich it either.
But hey, beggars can't be choosers. Rather this than Tokyo Necro gacha collab.