One day at Lockwirdz High School, a popular high school in town, however one day there was news of a case where a student was found dead in the gym with a torn mouth hit by a dumbbell in his mouth, the case stated that the victim was not killed but by accident suicide

Then in the blue lock building where the soccer kids gather talking about the news that is spreading widely, there are Isagi, Reo, Nagi, Rin, Sae, Aiku, Kaiser, Chigiri, and Bachira gossiping about it