Shoko's only enjoyment is taking "selfies" and posting them on SNS.
One day, she received a friendly comment on her SNS from username MAKO, and her heart pounded as she finally made a long-waited SNS friend.
But few days later, a message popped up on Shoko's SNS posted by someone pretended to be her.
All this time, Shoko hadn't realized she was involved in the terrifying nightmare.