OVA
Description
Hazuki Mizuhara is the heiress of the Mizuhara Dojo, celebrated as one of her generation's most naturally gifted martial artists. Trained rigorously from childhood under her strict father, she was expected to uphold the family legacy solely in support of a male successor, never as the primary inheritor. Her father's disapproval of her romantic feelings for Seed Cashima, the dojo's least skilled student, led to a significant deception. She entered the Toushin Tournament partnered with the dojo's star pupil, Billnas, unaware the tournament's outcome would determine her forced marriage.

Initially believing Seed had voluntarily entered the tournament, Hazuki felt inspired to strengthen herself. She undertook perilous training within the Ragnard Dungeon, confronting life-threatening combat for the first time, including a near-fatal battle against a Caterpillar DX. These harsh experiences shifted her reliance from innate talent to disciplined dedication, deepening her understanding of martial arts and her personal limits. Learning the truth of her father's scheme from Billnas, she passed the Mizuhara Wind Sword to Seed and supported his journey. After Seed's victory over Billnas, Hazuki and Seed vowed to marry.

Following Seed's subsequent disappearance due to a dark scheme involving Apros, Hazuki independently entered the next Toushin Tournament. She defeated the new champion, Border Galois, and resisted Apros's attempt to turn her into an Angel Eater. Apros instead used her to manipulate Seed, leading to a confrontation where Hazuki offered her life to save Seed from the Oni King. Passing the Mizuhara Heaven Sword to him, they defeated Apros and Dellas together before returning to the dojo.

Later, after Seed became a "God of Fighting" and gained her father's permission for their marriage, Seed isolated himself in the God of Fighting's mansion. To reunite with him, Hazuki resolved to enter the God of Fighting Tournament herself. While training in the Ragnard Labyrinth, she was transported to an unknown realm and kidnapped by the Brain Flayer Shara, who captured strong heroines from various universes to turn them into preserved plastic statues. Escaping confinement and battling minor monsters, she encountered Fuuma Kotaro. Through teamwork with other captured heroines and strategic costume changes to disrupt Shara's powers, Hazuki contributed to identifying Shara's weakness. Equipped with a Taimanin suit, the group defeated Shara, freeing all captured individuals and allowing Hazuki to return to her world.

Hazuki's personality evolved from early confidence rooted in natural ability to a mature discipline forged through adversity, though she retained a bright, optimistic, and playful demeanor in casual interactions. She displayed quiet rebellion against her father's rigid ideals and independent decision-making. Her love for Seed Cashima remained central to her growth, driving selfless actions like unwavering support during tournaments and repeated life-risking efforts to protect or reunite with him. Her combat abilities center on sword mastery, including the Wind Blade technique.

In appearance, she has straight black hair styled with V-shaped bangs and green eyes, though her hair is sometimes depicted as blue. She weighs 43 kilograms. A timeline variant depicts her following a "good ending" where she was about to marry Seed before her interdimensional kidnapping.