Quote Originally Posted by Ryllharu View Post
Her line states it very clearly. "I've never played it, but I heard about it from someone in my country." That was immediately after Rimuru started to ask her if she was from Japan, she actually interrupts him as Rimuru begins to say "Nihon."

The implications are super obvious:

She's not the only Summon from Japan.
The other obvious implication:

How obnoxious must that friend be if he talks about DQ so much that a girl that's never seen a video game can recognize DQ quotes...