Kyou kara Kakemochi Shitennou!

is a Japanese light novel series written by Takato Hyousuke, with illustrations by Kota. The series began publication on November 9, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Rio Hatsushima who started the net game "Yuma War Online" where the brave army and the demon army fight.

He became friends with Asami Uruno, who plays as a hero, and becomes one of the guards who protects the hero while being a netoge amateur. Meanwhile, Rio learns that her childhood friend Arisa Hayasaka is the Demon King. He secretly creates another character to protect the lonely Arisa and becomes one of the four heavenly kings who protect the Demon King.

In order to protect the cute hero and cute demon king who play under the strict condition that the character disappears if they lose, Rio will interfere with the conclusion of the two in two roles ...!?