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Icon-kabuto.png This article is about a/an ally in Kamen Rider Kabuto.

For the A.R. World version, see Mayu.
"Why did it have to be me?"
―Hiyori's catchphrase[src]

Hiyori Kusakabe (日下部 ひより Kusakabe Hiyori) is a character in Kamen Rider Kabuto. She is 18 years old.


Hiyori Kusakabe is first shown as a co-worker of Kagami's at the Bistro La Salle. She was involved in the meteor crash seven years ago along with Soji Tendo. Due to the accident, her parents were killed. She believed that they were murdered by a person wearing a Rider Belt, but after a period of uncertainty she concludes that Tendo, despite owning the belt, would never do something like that. After seeing Gatack wear another belt and discovering that he was Arata Kagami, she also began to doubt him. In the end however, she decides to trust both of them as they have helped her so much. She carries a green crystal that originated from Area X, ground zero of the meteor crash. She seems to be able to talk with and read the emotions of inanimate objects, such as drawings and machines. She's quite clumsy and tends to zone out while working, resulting in complaints by customers. She is also impudent towards others as well as initially being bad at socializing with others. Through several mishaps and accidents, she was able to discover the identities of all the Riders besides Drake.

Later in the series, it was discovered that Hiyori is the child of a Native Worm who impersonated Tendo's mother down to her pregnancy, and later gave birth to Sisyra Worm. This technically makes her Tendo's younger sister. During episode 33, the energy charge from the Hyper Zecter sent her along with Soji Kusakabe to the edge of time and space. The Hyper Zecter later appeared in the normal dimension, showing one of Hiyori's drawings to Tendo and Kagami.

She reappeared during episode 38, being led away by Soji Kusakabe, at the edge of time and space. She returns to the real world in episode 43 to defend Dark Kabuto from Hyper Kabuto, stating that she no longer desires to live in the human world. Ultimately however, after a compelling speech by Tendo saying that she will not be hated in the human world, even though she is a Worm, she abandons Soji Kusakabe and returns to the human world. However, she is then attacked by Dark Kabuto. After being saved by Tendo, she returns to an almost normal life, and begins making her own menu and dream of owning a restaurant come true. During the epilogue, she returns to her normal life in working at the Bistro, and now has Jyuka as a sister.

As Worm

Sisyra Worm (シシーラワーム Shishīra Wāmu) is Hiyori's alter ego, Sisyra Worm surfaced after Hiyori was in danger of being killed by Worms. Like Tadokoro, she is a Native who chose not to attack humanity.

Video Game Appearances

Kamen Rider Break Joker

Sisyra Worm Break Joker card

Sisyra Worm appears as a playable character with other Riders and monsters in Kamen Rider Break Joker.


Despite being a girl, she uses the pronouncation 'boku' (boyish way of saying 'I') instead of watashi/atashi (formal way of saying 'I'), and may come off as rude to others since she addresses them as 'omae' (mostly used by men to refer the person they are close with as 'you' compared to women) regardless of gender and age, as commented by Tendo, who advised her not to refer her customers with 'omae'.

She is a bit of a slowcoach, as shown in Episode 1. She was waiting for some saleswomen to stop conversing with one another when she wants to buy some jewellery from them before Tendo arrive and tell those saleswomen that does not even bother to look at their customers. She is also quite misanthropic, questioning to others why she should be the one to do the cooking or come to a party.

She also seems quite emotionless at first, but it is later revealed she can smile and also get angry, especiallly when Kagami skips his part time job, most of the time.

Despite being like that, she is shown to be friendly and caring, as when Gon (Yuriko) was kidnapped by Kageyama, she was willing to do anything to save her. She was also willing to help Gon when the latter wants to apologize to her partner, Daisuke.


  • Master Chef: To be added
  • Skilled Artist: To be added


Sisyra Worm

  • Height: 216 cm
  • Weight: 115 kg

Appearances: Kabuto Episode 31-32, 43-44

Behind the Scenes


Hiyori Kusakabe was portrayed by Yui Satonaka (里中 唯 Satonaka Yui),as child Hiyori was portrayed by Reika Fujisawa (藤沢 玲花 Fujisawa Reika), who will later portray as Chizuru Hoshino in Kamen Rider W 3 years later.


  • The name comes from "sisyra" which means Kagerou.

Concept Art

Sisyra Worm was designed by Yasushi Nirasawa (韮沢 靖 Nirasawa Yasushi).

Sisyra Worm concept art



Icon-kabuto.png Kamen Rider Kabuto
Masked Rider System Users
Soji Tendo (alternate) - Arata Kagami - Daisuke Kazama - Tsurugi Kamishiro - Sou Yaguruma - Shun Kageyama - Masato Mishima - Soji Kusakabe
Movie-exclusive Riders: Issei Kurosaki - Hidenari Oda - Tetsuki Yamato
Transformation Devices
Rider Belt - Rider Brace - Drake Glip - Sasword Yaiver
The Zecters
Kabuto Zecter - Gatack Zecter - TheBee Zecter - Drake Zecter - Sasword Zecter - Hopper Zecter - Dark Kabuto Zecter - Hyper Zecter
Kabutick Zecters
Hercus Zecter - Ketaros Zecter - Caucasus Zecter
ZECT Kunaigun - Kabuto Kunaigun - Gatack Vulcan - Gatack Double Calibur - Drake Glip - Zectmizer - Perfect Zecter - Sasword Yaiver - Sasword Antenna - Blood Vessels - Anchor Jack - Machinegun Blade
Kabuto Extender - Gatack Extender - Machine Zectron
Hiyori Kusakabe - Jyuka Tendou - Yumiko Takemiya - Gon - Jiiya
Other allies: Takeshi Hongo
Riku Kagami - Masato Mishima - Renge Takatori - Yuzuki Misaki - ZECTroopers
The Natives: Daigo Tachikawa - Shuichi Tadokoro - Negishi - Masato Mishima - Hiyori Kusakabe
Worms: Aracnea Worms (Aracnea Rubor - Aracnea Flavus - Aracnea Nigritia) - Lanpyris Worm - Bellcricetus Worm - Epilachna Worm - Pulex Worm - Verber Worms (Verber - Verber Rota) - Coleoptera Worms (Coleoptera Aeneus - Coleoptera Croceus - Coleoptera Argentum) - Musca Worm - Sectio Worms (Sectio - Sectio Acuere) - Formicaalubus Worms (Formicaalubus - Formicaalubus Oculus - Formicaalubus Maxilla) - Brachypelma Worms (Brachypelma Aurantium - Brachypelma Viridis) - Tarantes Worm Purpura - Geophilid Worms - Acarina Worms (Acarina - Acarina Amber) - Viella Worm - Sepultura Worm - Genomyas Worm - Culex Worm - Foliatus Worm - Cammarus Worm - Camponotus Worms (Camponotus Oculus - Camponotus Maxilla) - Cochlea Worm - Leptophyes Worm - Subst Worm
Executive Worms: Uca Worm - Cassis Worm