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Description
Hotarubi is a fictional character from the 2005 live-action film Shinobi: Heart Under Blade, which is an adaptation of the novel The Kouga Ninja Scrolls. She is a kunoichi, a female ninja, of the Iga Tsubagakure clan. Petite and slender with straight, dark hair that falls just below her shoulders, Hotarubi embodies a traditional Japanese beauty. She typically wears a long, purple kimono and her eyes are a deep purple color. In the film, she is noted for her round face and large, round eyes, giving her an appearance that fits a classic depiction of a Japanese manga or high school girl.

In terms of personality, Hotarubi presents a serious and no-nonsense exterior when she is with her fellow Iga clan members. However, her primary driving force is her deep devotion to her fiancé, Yashamaru, who is also a ninja of the Iga clan. When in his company, she shows a more innocent and slightly child-like side, which includes displays of jealous temper. Her concern for Yashamaru is so profound that any suggestion of him being harmed can send her into a feral rage, demonstrating how her emotions are directly tied to his safety. While she shares her clan's animosity towards their rivals, the Kouga clan, her personal motivations are largely centered on Yashamaru. Following his death, her purpose becomes solely focused on seeking revenge at any cost.

Hotarubi’s role in the story is as one of the Iga clan's chosen warriors in a deadly conflict against the Kouga clan, a war instigated by the shogun Tokugawa Ieyasu to settle a succession dispute. Despite Oboro being the official leader of the Iga, Hotarubi, like most of her clansmen, defers to the more commanding figure of Yakushiji Tenzen for orders. Her key relationship is with Yashamaru, to whom she is engaged. This relationship is central to her character, and her distress over his fate is a recurring theme. A notable aspect of her dynamic with Yashamaru is her pet viper, which causes him discomfort, though Hotarubi herself remains oblivious to his feelings about the snake. She also holds great respect for her fellow Iga ninja Nenki Mino, always addressing him with a formal honorific. In the film's narrative, her relationship with Oboro is different from other versions of the story; here, Hotarubi is fiercely protective of Oboro, stating that the clan leader is the most precious thing to her, which ultimately leads to Hotarubi sacrificing her own life to shield Oboro from an attack.

Hotarubi’s notable ability is the manipulation of butterflies. She uses this power for several purposes, including summoning swarms to distract her enemies in combat, allowing her allies to land a fatal blow. She can also deploy her butterflies for reconnaissance, sending them out over long distances to search for the missing Yashamaru. In the film adaptation, she performs this ability by using a yellow powder that she spreads on her fingers, and the butterflies she summons are orange in color. In addition to her butterfly-based powers, she is a capable fighter with a tanto, a short blade, which she carries tucked into her waist sash.

Tragedy defines the arc of her character. After Yashamaru is killed, Hotarubi is consumed by a desire for vengeance. Her own life is cut short when she is killed by the Kouga ninja Chikuma Koshirou during an ambush. Her death marks a pivotal moment in the escalating war between the two clans.
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