TV-Series
Description
Shizuru Nakatsu serves as a first-year Kazamatsuri Academy student and public morals committee member. Reserved and honest, she communicates primarily through expressive gestures and facial expressions, enabling others like Kotarou Tennouji to understand her. Her appearance features golden blonde twin ponytails, blue eyes, and heterochromia giving her right eye a golden hue—a trait concealed beneath a white eyepatch. She typically wears the school uniform: a light-pink dress with red outlines, white stockings, and a red ribbon, switching to a black butler-style outfit in combat where she may remove the eyepatch.

Her childhood unfolded in a financially strained yet happy family. A familiar-caused fire led to her father shielding Shizuru and her mother from debris. Unconscious activation of her healing abilities saved her family but altered her eye color, creating the heterochromia. Rescued by Guardian, Shizuru joined the organization in exchange for financial support, a decision that later sparked parental conflict. During one heated argument, she inadvertently erased her parents' memories of her existence.

As a Guardian operative, Shizuru possesses enhanced speed and strength surpassing ordinary humans and some superhumans. Her primary power enables internal production and manipulation of diverse chemicals—functioning as antibiotics, steroids, anesthetics, or toxins—which she can emit as gases, exemplified by paralyzing Sakuya with a neurotoxin. She also exhibits regeneration and difficult-to-control memory erasure abilities. Her combat skills include dual knife proficiency and lipreading.

Her narrative involvement varies significantly across routes:
- Her dedicated route involves protecting Kotarou under Guardian orders, leading to cohabitation. She later links her life to his to save him from fatal injuries, erasing his memories and entering a coma. Awakening results in permanent hearing loss. She battles Gaia, witnesses the world's destruction, survives in a shelter, and encounters Kotarou transformed into a tree.
- Kotori's route features her offscreen assassination of the Key using a rifle.
- Chihaya's route depicts her battling Kotarou and Chihaya alongside Touka, releasing neurotoxins against Sakuya. Witnessing Touka's brutality prompts her to question Guardian's methods. She is later impaled by Kotarou during his mental rewrite and assists in halting Sakuya's rampaging familiar form.
- Lucia's route shows her aiding Kotarou in taste-testing Lucia's cooking, engaging in a mall battle with Lucia employing chemical abilities and knives, and later conveying information about Kotori's whereabouts.
- The Moon route sees her summoned to defend Moon Kagari, where she is killed during the conflict.
- Terra route details her induction into Guardian alongside Touka. The epilogue shows her and other heroines contracting with Kotarou as a familiar for a journey to the moon.

Personally, Shizuru holds a strong preference for saury, frequently consuming it and sharing grilling traditions with her father. Despite her public morals committee role, she primarily uses it as an excuse to spend time with Kotarou rather than enforce rules.