RENI posted a Halloween picture of herself at KAWASAKI.

RENI posted a costume photo of her cat, the next day, She posted her own Halloween cosplay instagram.
This photo is taken at the Halloween event held in Kawasaki City. RENI seems to have participated with her friends in full private, not MCZ's work.
A lot of sightings of fans who accidentally met RENI and talked to each other are stated in Twitter.

She wrote in the comment section, "I already think about next Haloween..."