If it was going to be used to lock and unlock doors, Ryusei was going to have to. Works like the Kaban, Kengo had said, which meant, probably, that it had analytical functions. And Ryusei already knew about the healing. Kengo had shown him how to turn it on; Ryusei could figure out the rest on his own.

Next. "You came here earlier than me. How often do people show up at the hangar?"

There was some kind of space-time compression theory out there, Ryusei knew, but without knowing exactly what the theories were or how space travel actually worked here, he didn't know whether it applied to his and Kengo's temporal displacement situations or not.

—It didn't matter. The question he'd just asked didn't matter.

"No, never mind that." Next. "How'd you get this apartment? Not allowed to have one without a roommate, did you say? Allowed by who?"