Ikishini

Ayano Mori is a young girl who spends her days chasing after black money to cover her mother's debts. One day a suspicious homeless man offers her an extremely high-paying part-time job that pays 300,000 yen for 72 hours of work. Ayano is suspicious but applies for the job. What type of shady situation did she get herself into?

(Source: Kadokawa, translated)
Synopsis from AniList