A mysterious Luden who appears in Sagami City's subway system. He introduces himself as Snark. He looks like a station attendant, but his true identity is unknown. Well, I know it, but still.

Despite his immense power, he avoids getting directly involved in anything. Not out of fear or unwillingness—he's simply too powerful and doesn't want to alter the outcome unpredictably. His logic makes sense, honestly. Maybe he's some kind of tsundere?

Still, Sayaka ends up borrowing a good deal of his power, but only partially... Is he a boojum? Or something else entirely...?