KOWABON #05

Today is Takako's birthday party.
Naoto, along with 2 of his friends got together to celebrate Takako's birthday, except Mizuho who originally planned the party were out of reach for 2 days.
As Naoto was video-taping the fun gathering, Mizuho's message arrived on Takako's smartphone.
From that moment, paranormal phenomena started happening.
What did Naoto's video camera witness…?