I think it's a Belphegor reference
Belphegor is a demon associated with sloth, often depicted either as a monstrous, horned figure with claws sitting on a toilet, or as a beautiful woman who seduces people
Also, the word
Azatoi in the title means something like “Calculatingly charming” it describes someone who deliberately acts a certain way to get attention or make others like them
Kinda lines up with how Hayami is