I'm afraid we won't learn the mirror's secret just yet - but we'll get there eventually... someday.
Comic transcript
Taku: "It's fine. I believe you."
Serika: "Really...?"
Taku: "Well, to be precise... I don't know about a curse, but I'm sure you must have seen SOMETHING. We've known each other since kindergarten. You wouldn't pull a dangerous stunt like this for no reason."
Kei: "So... does that mean the rumors were true after all?"
Taku: "Even if they were, the mirror's broken now. It doesn't matter."
Kei: "..."
A gloomy atmosphere falls over the room as Kei and Serika both stare at the floor in worry. Taku tries to change the subject.
Taku: "ANYWAY. We should clean up and get out of here. I'd like to get home sometime soon."