[Sure, Chuuya will take some conjured demon tea, why not? He takes a careful sip of the hot liquid as he listens to Mephisto’s explanation, and honestly? He’d half-expected evil laughter and a villain song as soon as he’d signed the contract, but he’ll take tea instead.]

A fatal verse? Then that’s your weakness? Does anyone know yours?

[He’s gonna go with no.]

How would you ever figure out what it is, though? My world doesn’t exist anymore. You’d just have to guess.

[It sounds hopeless, but if anyone can figure it out...]

You were supposed to tell me other weaknesses too, remember? For telling you the name. Don’t think I forgot.

[Unless that just so happens to be a demon’s only weakness, but if exorcists used to exist, then he doubts it. Surely they had weapons effective against demons as well.]