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Three middle school girls are overjoyed to be soon graduating to high school status, and they sneak into their new high school, a private school, for a peak a day before their admission. But everything starts to get out of control when they meet three other middle schoolers who mistake them for high school students and start calling them Senpai.

Shibusen, standing for Death Weapon Meister Academy (DWMA) the technical school for Reaper Armsmasters that operates from the deepest recesses of all the corners of the world, in order to prevent the second coming of the so-called Demon God who is feared upon bringing destruction of all humankind and envelop the world with nothing but madness and darkness. The reaper built this agency for weapons and for those who will be trained to wield them.