Kaii to Otome to Kamikakushi

Ogawa Sumireko is a busty bookstore clerk who wants to become a novelist after some writing success in her youth. When strange occurrences start cropping up around the city, she teams up with her flirtatious co-worker Adashino Ren to look into them. But Ren is hiding a secret of his own! With their combined skills of occult knowledge, what will they discover as they investigate?
(Source: Seven Seas Entertainment)
Note: Nominated for the Tsugimanga 2020 Award in the Web Manga Category.