Due to an attack by the Khaos Brigade, the Rating Game between Sairaorg and Rias has been pushed by three weeks. They will use that time for training however they get some help from a dimensional being. And all they need is to watch a show called DEATH BATTLE!

AU. What happens when the legend of the Oppai Dragon gets a boost at the very beginning. Follow Issei and his companions as they watch one of the most beloved and oldest web series of our world. DEATH BATTLE! What will they learn? How will they grow? Will Issei get laid? Probably not that last one. Inspired by Overlord Wnag-Yu and Doctor Snivy.

SLIGHT AU! What happens when not only does Rias hold herself from lashing out at Riser's so called offer for a month of training for their Rating Game, but also that she and her peerage, including a recently freed Gasper, find out a box with many videos about a famous Internet Web Show about characters fighting to the death? And also they actually learn from said fights?