Mi-chan to Airi

Midori, a corporate office worker, is busy with work day and night. She eats mostly bento from convenience stores, relaxes with cigarettes and alcohol, and spends rough days of no sleep. While on her way home one day, she finds a girl sleeping in a garbage dump. She helps her on a whim, but Airi, who uses mysterious powers and calls herself a "witch", begs Midori to "keep her at home for a while'', and they end up living together...!? The life of an office lady x a fallen witch begins!

(Source: Wings Comics, translated)