Kuroageha anime
Biographical Information
Kanji 蟲奉行
Rōmaji Mushibugyou
Also Known As Black Swallowtail
Insect Magistrate
Princess Naa
Physical Description
Age 100+
Gender Female
Family Jinbei Tsukishima (Husband)
Three Unnamed Children
Allies Jinbei Tsukishima (Love Interest)
Occupation Magistrate
Affiliation Mushibugyo
Manga Debut Chapter 27 {shadow (Jōjū Senjin!!)}
Chapter 34 {official (Jōjū Senjin!!)}
Anime Debut Episode 7
Seiyū Megumi Han (Japanese)
Kari Wahlgren (English)
Image Gallery

Kuroageha (Princess Naa) is a magistrate of Mushibugyo . She is the character of Joujuu Senjin!! Mushibugyo and played a major role in second part of the series. Kuroageha was the main enemy of Mushikari (Insect Hunters), who sought to kill her at all costs. Jinbei befriends her unaware of her true identity and she eventually falls in love with him.


Kuroageha is short and petite young girl. She has fair-skin, green-eyes, straight azule hair reaching her ankles, and very noticeably thick azule eyelashes. She is regularly seen wearing a long layered light blue kimono, with blue stripes, and long purple obi sash and a matching square-shaped hat with a bell tied on each side of her hat. For a short time, she had only one bell after giving one to Jinbei out of gratitute, but later replaces the one given away.

She later wears a plain violet kimono, straw hat, and geta sandals, when she is disguised.

When she fully transforms into an insect-human, her clothes darken black with a dark purple aura, her hair turns black, and finally she grows a pair of dark purple Kuroageha butterfly wings, hence her new name; Black Swallowtail (butterfly)...which only a few higher ranking characters know of (initially). 

Image Gallery


Kuroageha had shown to be dark and mysterious due to her powers and past, but lightened up when she befriended Jinbei and falls in love with him. Despite her seemingly dark and mean nature, Kuroageha has shown to be selfless as she is willing to help others, even if she lost her times with the conviction to give up her own life, if it means someone else would be saved. Whether the reason she might be doing this is due to her dark past, was simply in her nature her entire life, or a combination of both, it doesn't change the fact she has changed drastically after meeting Jinbei. Although her being cold to everyone at the begining was most likely due to mistrust of people who don't think too fondly of her due to her powers, like the Insect Hunters.

It's revealed later on she was once merciful and kind to all creatures, no matter how ugly as some have described, when she choose to care for an insect that looked like a larvae or grub...something that would ultimately decide her fate, and affect others as well.


Kuroageha without her power

Kuroageha prior to the series beginning without her power.

Kuroageha was born Princess Naa around just after the Sengoku period, while Toyotomi Hideyoshi was in power, more than a hundred years ago prior to the start of the series. When tragedy struck from her house being invaded, she was killed in cold blood. She was later brought back to life by a worm-like insect/bug (mushi) she had previously saved and cared for, out of pity for it. This bug would later also be responsible for giving rise to the ultimate mastermind and antagonist of the anime.

After she was revived, her hair color faded, and emited gasious poison from her skin. That resulted in the accidental deaths of everyone in the castle unfortuante enough to come in contact with it, like soldiers from both sides, even her own parents, whom looked upon her as a monster. Fast forward a hundred years later to the start of the series, she has now become the Insect Magistrate due to her unique powers, having aged not a single day.

Kuroageha getting her powers

Kuroageha recieves her powers from the eternal insect

She now wears gloves and covers her entire body except her face, to minimize the amount of poison she emits. To furthur prevent any harm to others, she normally appears behind a screen, partly due to her position, but mainly for any potential accidental bodily contact with others.

Even when feeling imprisoned, she is still responsible to her duties. That is, until the day she meets Tsukishima Jinbei, who would end up changing her entire life, starting with her outlook on life itself, and her once solitary personality; merely from his innocent kindness, and genuine earnestness. It's after this that she feels more comfortable to be around long as they do not touch her skin.

Most know her by her title, as the Insect Magistrate (Mushibugyou) and address her so. However Jinbei is the only one that sees her as much more than that. At first, Jibei mistakenly refers to her as the Mushibugyou's servant/ helper/ assistant (often translated to simply "Miss"), and just as he always has; even after finding out her true identity as a princess near the end of the show, when Sanada Yukimura refers to her as Princess Naa infront of him. Although, it could just mean he doesn't see her as the Magistrate--whether it's because he wants to see her for who she is instead of her title, or if he's simply just the same idiot he's always been--it remains unknown.

It was shown that she has known Oooka Tadasuke.

However in the OVA episode 3, it is shown that she is inside the Osaka castle near the cocoon of the eternal insect, this might suggest that certain events in season 2(which in 2017) transpired to place Kuroageha there.Jinbei and his friends will come to save her..


Kuroageha Arc Edit

Kuroageha appears inside a temple waiting for the insect hunters.[1] She is ultimately greeted by Jinbei, who crashes inside the temple. They talk to each other for a bit, and finally, the Insect Hunters appear to kill her. As she tries to fight them, she is interrupted by Jinbei. As he is trying to protect her, Kuroageha thinks that he is with
Kuroageha blush2

Kuroageha falls in love with Jinbei.

the Insect Hunters. As she was about to ask him, she is surprised to see him being attacked by the Insect Hunters. As she was about to be killed by the Insect Hunter leader, Jinbei jumps in and protects her. After that, Jinbei tells her to get the Mushibugyo and get out of here, also telling her a promise that together, they will again see the skies of Edo.

Kuroageha Dark Butterfly form

Kuroageha battles the Insect Hunters after Jinbei's "death".

  Upon hearing this, Kuroageha falls in love with Jinbei and is greatly saddened over the apparent death of Jinbei. She transforms into her true self and attacks the Insect Hunters out of anger. She has the upper hand, until they disable her poison powers. As the Insect Hunters wonder how to kill her, Kuroageha is happy to see that Jinbei is still alive, but unconscious and barely. She tries to get attention from the Insect Hunters, but one of them finds out that Jinbei is alive. As they try to kill him, Kuroageha shouts in horror, but Mugai steps in and saves him. Kuroageha then carries the unconscious Jinbei, and is fully unaware of his developing transformation.[2]

Kuroageha is surprised to see Jinbei
Jinbei on Kuroageha lap

Jinbei sleeps on Kuroageha's lap.

awakened, but as a blood-thirsty monster. She watches Jinbei fight and kill Sougan, impressed by his new physical capabilites. Jinbei goes after the other Insect Hunters, and Kuroageha follows him. Then, she is found out by one of the  Insect Hunters and as he is about to kill her, Kuroageha thinks that she won't keep her promise to Jinbei. Just then, when she was about to be killed, she is saved by Jinbei once again. Jinbei then reminds her of the promise, after regaining his sanity, and promtly falls asleep in her lap. She smiles graciously at the sleeping Jinbei, but is annoyed that Hibachi hits him, since she was angry that he attacked them and then merely falls asleep afterwords. After that, the Insect Hunters withdraw, resulting in the Insect Magistrate's victory.  She then goes back to Edo with the Insect Magistrate.


Her body can produce a powerful poison capable of killing any living being who touches her skin. When using her
Kuroageha activated her powers

Kuroageha activating her poison power.

powers to the fullest, she manifests giant dark butterfly-like wings, hence her alias Kuroageha, which means "Black Swallowtail" in Japanese; a particular type of butterfly.

In the past, her poison was new to her and uncontrollable, and seeped out through her skin as a purple gasious mist or fog that kills any who inhale it, without needing physical touch.

The only one who seems to be able to withstand and endure her poison is Tsukishima Jinbei, as shown when he has touched her countless times; everything from being carried, to doing the carrying. He was also able to survive falling into the poisonous well, which share similar, if not identical properties to Kuroageha's poison.


Kuroageha vs. Insect Hunters  - (Lose)


Jinbei TsukishimaEdit

At first she paid no attention to Jinbei, but after he nearly sacrificed his life trying to protect her from the Insect Hunters, she began to take a greater interest in him. She falls in love with him as the series progress. Kuroageha had shown signs of jealousy when she saw Jinbei's father wanting Oharu to marry Jinbei.


  • She is the strongest member in power alone, of the Insect Magistrate--the second being Mugai.
  • She is one of the four girls in love with Jinbei, the others being Oharu, Hibachi, and Irori.
  • According to Sanada Yukimura, he claimed that Kuroageha has some relations to the fallen Toyotomi Clan, as he refers to her as Princess Naa, indicating she was the daughter of a lord. Whether her father was Toyotomi Hideyoshi or simply a vassal to him, it remains unknown, except for the fact that Sanada Yukimura served the Toyotomi clan at the time of his (human) demise while searching for any survivors in the fire that burned down the castle, namely his lord and Princess Naa.
  • In the manga, near the end of the Kishuu Arc, she regains her powers and her Kuroageha form and defeats Yukimura, however she was forced to return with the Eternal Insect rather than go back to Edo as shown in the anime.
  • Kuroageha gets her name from when she transforms into a Black Swallowtail butterfly with dark purple/black wings, and black hair.


  1. Ep 9
  2. Ep 10-11


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