[His sister...? That's apparently part of Mahiru's plan so Guren being quiet can either mean he's wondering about that or he knows or it's half and half since he's actually namanari. It's fine.]

It's not that simple. The things this place throws at us can draw out your demon even more, and that's not good if we don't have the supply to keep it from getting worse. I've been working on the replica drug with someone, but...

[They're going to need it now. He'll message Ryo later.]

I'll worry about it later. [He's visibly exhausted, but the less he shows Yuu that, the better.] Have you run into anyone yet?