Tsukushiin Touko, a first-year Course 1 student at Third High School, carries the legacy of her family’s distinguished Shinto-style Water-Spirit Magic as heir to the Tsukushiin lineage. Her striking appearance features long blue hair cascading to her thighs, crowned by a single ahoge, and she frequently dons traditional shrine maiden garments beyond campus grounds. Brimming with cheerful optimism, Touko’s speech weaves archaic Japanese terms like "washi" and "yoi," lending her a quaint, grandmotherly charm. Confident in her magical prowess, she approaches rivalry with spirited respect, balancing competitive drive with camaraderie—particularly toward adversaries like Mitsui Honoka. A dual practitioner of ancient and modern magic, she commands Water-Spirit Magic to summon elemental spirits, conjure whirlpools, and unleash tidal surges. Her battle tactics layer deceptive traps amid genuine threats, countering sensory-based foes. Simultaneously, she wields Movement-Type Modern Magic to manipulate engagement distances, harmonizing both disciplines with fluid precision. Her arsenal includes twin bracelet CADs: a crimson model channeling modern spells and an azure counterpart reserved for ancient and aquatic techniques. At the 2095 Nine Schools Competition, Touko claimed second in the Women’s Newcomers Battle Board event, rallying her Third High teammates through infectious enthusiasm and sharp strategic guidance. The Tsukushiin family’s historic ties to the Shirakawa lineage—another eminent Shinto magic house—anchor her heritage, while her friendships with Isshiki Airi and Kanou Shiori, peers adept in modern and ancient magic, reflect her collaborative spirit.