During the finale special of Wonder Egg Priority, after successfully clearing her mission and saving her sister, Neiru is seen confronting Frill and her minions. We see a girl (who I presume to be Neiru's sister) fading away, but then the dream ends without showing what happened to Neiru herself.
Her secretary claims she's missing, but Ai later receives a phone call from her, and comes to believe she's in the Egg World somewhere.
What happened to Neiru? Was she killed? Is she trapped in a parallel world? Is she still in the Egg World?