Kuzu no Honkai décor started serialization in Monthly Big Gangan at the issue “2017 Vol.12”.
The manga is a spin-off of Kuzu no Honkai, aka Scum’s Wish.
The 1st chapter is as follows:
A Cinderella in a Subway.
Noriko Kamomebata calling herself Moka goes to a fashion school.
She lives a life without “him”.
Via – Comic Natalie: