Overview
Kunai is a mysterious swordswoman that players encounter during their journey in Beast of Reincarnation. Clad in traditional attire and bonded to a Malefact named Kirin, Kunai cuts an imposing and enigmatic figure across the game's post-apocalyptic Japan. She wields a katana with the same practiced composure as Emma, but her allegiance, motivations, and backstory remain deliberately obscured by the game's narrative design. Director Kota Furushima has stated that every character in Beast of Reincarnation carries "great secrets," and Kunai shows this philosophy, she is neither labeled as an ally nor an antagonist in any official material, leaving players to interpret her intentions through her actions and associations.
Allegiance and Ambiguity
Kunai's allegiance is one of the game's most carefully guarded mysteries. Unlike Brad and Kagura, who are at least described as "unlikely allies," Kunai receives no such designation. The official profile published in June 2026 fills in a great deal about her without resolving that question. She is a formidable swordswoman making her own way toward the Capital, skilled enough to cut a steel-bodied Golem clean in two. Like Emma she is a Blightborn travelling with a Malefact of her own, and for reasons the profile does not give, she repeatedly opens contact with Emma as though she is keeping watch over her. She is voiced in Japanese by Yu Kobayashi.
Two details in that profile carry weight. The first is that she travels to the Capital independently rather than under the Administrator's order, which puts her on the same road as Emma for reasons entirely her own. The second is that she initiates the contact. She is not a figure Emma stumbles across; she is a figure who chooses to reach out, again and again, and the profile stops short of saying why. Her ability to bisect a Golem also puts her at a level of capability no other human character in the game reaches, which the boss fights bear out.
Her colder, more calculating demeanor provides a stark contrast to Emma's personality. Where Emma is emotionally guarded due to her isolation and memory loss, Kunai appears composed and purposeful. A woman who knows exactly who she is and what she wants, even if the player does not. The duel that pre-release coverage expected does arrive: the campaign fights her twice, late, as a paired encounter with her own beast. Two women, each bonded with a Malefact, each wielding a katana, on opposite sides of a divide the story keeps quiet about until it does not.
Connection to Brad
Pre-release coverage circulated a scene in which Kunai was talking with Brad while Koo was nearby, whimpering and limping from an arrow wound, and Brad was asking for Koo's name. At the time the scene read as evidence that one or both of them had hurt the dog.
The shipped game settles the larger question without settling that scene. Brad turns out to be the operator of the Cleanse Walker, the walking vessel that carries Emma toward the Capital, and he keeps that role for the whole journey. Kunai stays on her own errand and ends up on the other side of two boss fights. Whatever passed between them in that clip, they are not a faction.
Malefact Companion
The shipped game names the companion Kirin. Kunai and Kirin are fought together as a single paired encounter, mirroring the Emma-and-Koo structure the player controls.
The pair is fought twice, both times late. The first meeting is at level 45 in the Crater Zone of the wasteland region; the rematch is at level 49 in the Capital Zone, one of the last encounters before the endgame. Both fights are weak to poison. Details sit alongside the other paired fight, Shidou and Nue, under Bosses.
Like Emma, Kunai has formed a bond with a Malefact, named Kirin in the shipped game. This parallel is one of the most significant narrative details revealed about Kunai, because it challenges a fundamental assumption about the game's world. Players initially learn that Emma's bond with Koo is extraordinary: a Sealer and a Malefact united by shared Blight Power, defying the natural enmity between their kinds. Kunai's existence proves that this kind of partnership is not unique.
Kirin fights beside Kunai rather than carrying her, which is what makes the pair a mirror of Emma and Koo rather than a rider and a mount. Where Emma leans on her plant abilities, the vine grapples, bridges and wall climbing, to cover ground and reposition, Kunai's advantage in the paired fight is that Kirin covers the range her katana cannot: Kirin's tracking projectiles keep Emma moving while Kunai closes. The contrast in fighting style holds either way. Emma's combat is intimate and grounded, built around parries and close-range exchanges, while Kunai's is composed and unhurried, punishing anyone who counterattacks out of turn.
The Two Encounters
Kunai and Kirin are fought as one boss with two health bars, and neither half telegraphs alongside the other, so the fight rewards picking a target and staying on it rather than splitting damage.
Encounter | Chapter | Level | Location | Outcome |
|---|---|---|---|---|
First | Chapter 8 | 45 | Crater Zone, Wasteland Region | Scripted loss. The story continues whether Emma wins or not, and taking Kunai down to roughly a quarter of her health triggers the cutscene that ends it. |
Second | Chapter 12 | 49 | Capital Zone | A real fight, and one of the last before the endgame. |
Both halves are weak to poison, which makes poison arrows and poison bolts the ammunition to stock before either encounter. Kunai parries and counterattacks the same way Emma does, so trading blindly into her is punished; her greatsword spin and her lightning slashes both reach further than her stance suggests, and the Blight pillar she launches from cannot be hit or parried on the way down. Kirin fires tracking missiles, sweeps a water beam, lays mud that slows Emma, and answers melee with rooted counters.
The second win pays out Kirin Memories along with Blade Art: Thunder and the Numasugi: Skewer Bloom Art. Blade Art: Thunder is described in the skill list as a technique Kunai devised, which is the closest the game comes to putting her sword style in Emma's hands. Her own blade, Camellia, can be collected from the Cleanse Walker afterwards.
Visual Design
Kunai is depicted in traditional Japanese attire, moving through the game's ruined landscapes with her Malefact alongside her. Her visual design blends wuxia warrior aesthetics with the game's corrupted natural world, presenting a figure that looks like she belongs to an older, more structured era of civilization. A sharp contrast to Emma's more feral, vine-entwined appearance.
Where Emma's design emphasizes her fusion with the Blight (vine-hair, sprouting flowers, plant matter integrated into her body) Kunai's design emphasizes composure and control. She appears untouched by the chaos around her, moving through a corrupted world with the bearing of someone who has mastered it rather than been consumed by it. This visual dichotomy reinforces the narrative tension between the two characters: Emma is defined by her affliction, while Kunai appears to have transcended hers.
Thematic Significance
Kunai's existence raises fundamental questions about the world of Beast of Reincarnation. If bonding with a Malefact is possible for someone other than Emma, what does that mean for the nature of the Blight? Is the bond between human and Malefact more common than the Colonies believe? Are there others like Emma and Kunai. People who have formed alliances with the very creatures that threaten civilization?
These questions connect to the game's broader themes about the relationship between humanity and nature. Director Furushima has cited Princess Mononoke as an influence, and Kunai's character echoes that film's exploration of individuals who exist between the human and natural worlds. She is neither fully part of civilization nor fully consumed by the wild. She occupies a liminal space that mirrors Emma's own position, but approaches it from a different angle.