Mammon was casually minding his own business until a person he's never seen before caught his attention. He'd approach the person from behind and tap their back.

"Hey, you look like someone my brother likes! Do you make music or anything??"

He asked as the person who he was talking to was Megurine Luka. Mammon didn't really recognize them but he was really curious to know more about them, it's not normal for him to have his attention drawn to someone he doesn't know.