Hidan No Aria

Moreover, known as Aria the Scarlet Ammo, is a Harem Series, but as well with lots of bustle and excitements. Whenever Kinji is "stimulated" by events around him, he switches into a sort of Super Mode called "Hysteria Savant Syndrome,' shortened as "HSS' or also called "Hysteria Mode."

Kinji attends Butei High School, a paramilitary Academy specializing in assault, reconnaissance, escort, etc. — specifically, the offensive-oriented Assault Section.  Even so, thanks to a certain incident, Kinji demoted himself to the more rear-line Inquesta Section and is planning on quitting Butei High altogether.  One day, however, he narrowly falls victim to a serial bomber called the "Butei Killer," and his life is thrown into a shock again, with the entrance of one of Assault Section's top students, the diminutive Aria H. Kanzaki.

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