Unreal: Fujori Zakka Ten (2025)

Mysterious shop where the salesperson knows the customer's names.
The gifts/items cause harm to the person that receives/uses it including leading to death of the individual.

A mysterious shop granting wishes and desires..... probably at the extend of exchanging lives.

*Spoiler*

While Unreal is about two high school bestfriends and TStHF is abou two 'past' lovers, the ways they are separate due to some circumstances and how one of them, in order to save the other one make an exchange/deals with a mysterious shop owner..... unknowingly becoming neverending deals that they need to overcome.