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In today's technology-driven society, everything has to move with the times, and magic is no exception. As spells are cast with various magic "codes", made up of binary digits, a computer becomes just as useful to the aspiring mage as a magic wand. One such would-be wizard is Koyomi Morishita, a girl who suffers from a bizarre inability to cast more than one type of spell. No matter how hard she concentrates she can only use code to do one thing: summon metal wash basins, directly above people's heads more often than not! Hoping to improve her versatility, she becomes a student of voluptuous expert witch Misa Anehara. However, with malevolent "daemons" - monsters summoned by unscrupulous magic wielders - appearing at every turn, Koyomi will need all the help she can get!
Mako-chan is striving to become a professional witch, but before she can graduate from school, she must travel to the human world to complete her studies. It is there she meets a lewd young man named Onodera Junji, whose intentions for Mako-chan are far from pure! Can Mako-chan’s magical skills transform a pervert like Junji into a good person or is her witchy career over before it’s begun?!