On "Onrain" is a rapidly growing social networking service that handles a wide range of content. The main character, Haru Inukai (Hajime Inukai), manages a certain community on this SNS that handles a wide range of content. One day before a three-day weekend, he receives a sudden message from a somewhat familiar ID: ......!
The sender of the message, Watora, "In just three days! Can you conquer him!