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!