Honoka Shiki was a battle striker who was exterminating the demons lurking in the world every day. Battle Striker Honoka has a technique called Burst Mode that temporarily strengthens her body. When Burst Mode is activated, it cuts the limiter of Honoka's body strongly, exerting incredible power, and even becoming pain-free. However, if you cancel this burst mode, you will be temporarily unable to move after that, so the condition for canceling the burst mode is to completely destroy the enemy. One day, he receives instructions from the command center to conduct an undercover investigation at a certain school, and heads to the school alone. She still doesn't know the cruel ending that awaits her at the school ... ［BAD END］