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A group of Worm (Chrysalis), as well as Leptophyes Worm, they mimicked all the students at Chorus Club of Seika School in 1999, and cooprate with the school's general director.
History[]
Background[]

Original club members
Seven years ago, the Worms mimicked all the members of the Chorus Club of Seika School, and participated in the 35th National Junior High School Choir Competition held at the time, winning first place. After that, the school's general director found out the truth, aware the members are actually Worms, he disbanded the chorus club. The clubroom was sealed off with a wall that had a mirror embedded in it, but the Worms continued to hide in the clubroom.
Later, they conspired with the general director, who always want to improve the school's reputation. Based on a rumor created by the general director about the "Cursed Mirror" (呪いの鏡, Noroi no Kagami) that could grants wishes, they began to attack students who make wishes on the mirror, and replaces the student. At that time, the Worms had a habit of singing the nursery rhyme "Toryanse," and since singing could be heard coming from the clubroom, which could not be seen, it was rumored at the school that they were the "ghosts of the chorus club."
Truth Exposed[]
The situation remained undiscovered for a long time, but when they attacked and mimicked the baseball club members, Jyuka Tendo heard the rumor about baseball club. She talked to her brother Soji Tendo, which leads Tendo, Arata Kagami, Yuzuki Misaki, Renge Takatori began to investigate the school by undercover.
After that, Tendo and Misaki found out that the chorus club members had disappeared for a long time since graduation, and that the room where the choir clubroom was located had disappeared from the school as well. Seeing them understand the secret, a Worm (Chrysalis) mimicking Misaki and prepares attacked Tendo. However, it mistook Tendo who reflected in the mirror and the real Tendo, make the mirror broken, revealing the existence of the chorus club's room and all the mimicked members.
End of the Ghost Story[]
All the mimicked members choose reverted to their original Worm forms, including Leptophyes Worm. As Misaki attacks them, the Worms disappeared into the mist, they heading towards Jyuka at school bus, due to she also make wishes towards the mirror before.
After comforting the students on the school bus, Kagami got off the school bus to deal with the Worms that came. He transformed into Gatack to fight Worms, and then Tsurugi also arrived as Sasword to join the battle. The two Kamen Riders destroyed all Chrysalises together, but they were overwhelmed by Leptophyes Worm. Kabuto also arrived to the scene, he transformed into Hyper Form, and defeated Leptophyes Worm with Perfect Zecter's Maximum Hyper Cyclone finisher attack.
Since the general director was arrested by ZECT for cooprate with Worms to sacrifice students, and all mimicked Chorus Club Members were eliminated by Kamen Riders, the ghost story surrounding the school came to an end.
Known Entities[]
These are individuals who have mimicked other students/characters except for the form of the chorus club members.
Personality[]
After mimicked a student, they will shown an evil smile or serious expressions, to show their difference.
Worm[]

Worm (Chrysalis)
Statistics
- Height: 214 cm~
- Weight: 124 kg~
The Chrysalis (サナギ体, Sanagi-tai) is the pupa form of Worm.
Powers and Abilities:
- Human Mimicry: Like all Worms, they can take the form of any human they see, duplicating their memories as well.
- Superhuman Power/Intellect: These Worms will mimick the original student and add his own outstanding abilities to make the student's performance in all aspects look better, results for improving the school's reputation.
Arsenal:
- Claw: The Worm's Chrysalis is armed with a claw on their right arm.
Appearances: Kabuto Episode 38
Behind the Scenes[]
Portrayal[]
While mimicking humans, their physical body is portrayed by that respective actors.
- While mimicking Aota, a Worm (Chrysalis) is portrayed by Nao Tsubaki (椿 直, Nao Tsubaki).
- While mimicking Keiko Kobayashi, a Worm (Chrysalis) is portrayed by Kasumi Suzuki (鈴木 かすみ, Suzuki Kasumi).
- While mimicking Yuzuki Misaki, a Worm (Chrysalis) is portrayed by Anna Nagata (永田 杏奈, Nagata Anna).
- While mimicking Jyuka Tendo, a Worm (Chrysalis) is portrayed by Natsumi Okumura (奥村 夏未, Okumura Natsumi).
Concept Art[]

Worm (Chrysalis) concept art
Worm (Chrysalis) was designed by Yasushi Nirasawa (韮沢 靖, Nirasawa Yasushi).
Notes[]
Appearances[]
Kamen Rider Kabuto
- Episode 37: School's Ghost Story
- Episode 38: The Dangerous Younger Sister