Suzu who is unhappy living in a very much abandoned rural countryside in Ino. Her late mother had gotten her into singing with some music apps but one stormy day she died while wading through the rapid river rescuing a young girl. Traumatised, she can't sing and her sadness kept her classmates away. Just then, her friend...

One day Lain Iwakura's class receives an email presumingly from one of their late classmates, after she had committed suicide. Usually she wouldn't even use the Wired network but suddenly she starts using the network, believing she would receive more messages even though everyone thought it was just a prank. Not long later, she...