High schooler Koyomi Morishita faces ridicule for her petite stature, mistaken for a grade schooler by peers. Amidst her struggles, she encounters Yumiko, targeted by a sinister magician. Koyomi's fate shifts when she crosses paths with Misa Anehara, a skilled mage, who mentors her in a revolutionary magic system based on coding sequences. Tasked with refining her erratic talent for summoning washbasins from above, Koyomi delves into a challenging journey of mastering the intricate art of magic, where nothing comes easy.