Need help finding manga

Jakuna January 13, 2020 3:33 pm

A person from a band uses a device which creates a lover based on given information. After 30 days the lover disappears after giving the person a ring.
I think the seme is called Rui, and the device is called Maria?

Responses
    FF_aeris January 13, 2020 4:47 pm

    I think it's called 'Monokuro Limit'