Kaya-chan Isn't Scary — Episode 8: Backwards Isn't Scary / The Sandbox Isn't Scary / Nice People Aren't Scary?

You are watching the episode Backwards Isn't Scary / The Sandbox Isn't Scary / Nice People Aren't Scary? Chie-sensei gets a call that Mobuo has suddenly gone missing. Is it related to the mysterious voice she heard?