Isekai de Pension Hajimemashita. Sekai de Yuiitsu no Kuromajo desu ga, Kono Chikara wa Okyakusama no Tame ni Tsukaimasu.

"There was still so much I wanted to do..."

A young woman dies in a fire at work and is reborn in another world as a black witch. Her new master, a talking black cat, tells her that black witches have powers capable of changing the world. But this witch has her own dream—to operate a boarding house that welcomes any and all kinds of guests!

(Source: Manga Up! Global)

Note: Chapter count includes two volume-bonus chapters.