At some point during MC's first weeks in the Devildom:
Lucifer: My brother Beelzebub keeps going to the kitchen at random times of the day and eating all our food while no one is looking.
Because of this, me and my other brothers have to take turns checking the kitchen throughout the day to ensure everything is in order.
MC: *confused* You're telling me all of this because...?
Lucifer: Because I need you to stop him. Your room is next to the kitchen, which means you can hear him from there and stop him in time, sparing us the trouble of doing it ourselves.
MC: What do I gain if I accept? 🤨
Lucifer: 30 Grimm for each time you succeed.
MC: *immediately* Count me in. 🤝