Nanase Aasu, the eldest of the seven Aasu sisters, nominally heads the family. She shoulders the duty of upholding ancestral traditions and preparing her sisters to protect Earth. Despite her self-perceived authority, her leadership proves largely ineffective. A lack of genuine responsibility or strategic planning reduces it to performative gestures, like pounding tabletops amid family chaos.

Her defining trait is an obsessive reverence for her ancestors. Portraits depicting them with open mouths adorn the Aasu household for constant consultation, serving as a recurring comedic element rather than a practical guide. As a Defender of Earth, Nanase wields the "Earth Dance of Flowers." This designated power manifests swirling cherry blossom petals from thin air. However, its purely aesthetic nature aims only to pacify enemies, rendering it functionally useless in combat or defense.

Physically, Nanase possesses long brown hair reaching her hips, brown eyes, and typically wears a hair ribbon with cheek curls. Her name, "Nanase," meaning "seven" in Japanese, follows the family's numerical naming theme, reflecting her status as the seventh sister despite being the eldest.

Her portrayal remains consistent as a satirical figure whose ineffectiveness and ancestor fixation underscore the series' parody of magical girl team dynamics.