This article contains major plot spoilers from the manga that have not been revealed in the anime. Proceed at your own risk.

Kenichi Yoshii


09 PTS

09 Anime

Kanji 吉井 健一
Romaji Yoshii Ken'ichi
Alias 09 (Zero Nine (ゼロキュー Zero Kyū?))
Biological Information
Species Human
Gender Male
Age 16
Height 161 cm / 5'3"
Hair Color Beige
Eye Color Light Green
Date of Birth April 2nd, 1997
Unique Features Glasses
Biographical Information
Status Alive
Relationship Status Single
Other Relations Nanako Tenjo (Friend/Ally/Love interest)
Former Affiliation CCC
  • Developer
  • Engineer
Manga Debut Line 6; Monster
Anime Debut Episode 6; Dogmatic
Japanese VA Shouta Aoi
English VA Nathan Wilson

Image Gallery v   e

Kenichi Yoshii (吉井 健一 Yoshii Ken'ichi?) was a member of the CCC in which he went under the code name 09 (Zero Nine (ゼロキュー Zero Kyū?)). Unlike Nanako Tenjo (Zero Seven), he worked in the background developing technologies they could use in the field.

He has a genuine crush on Zero Seven, but he initially didn't have the courage to straightforwardly approach her and would often secretly take pictures of her sleeping and collect them.

During Plan B (The Ikebukuro Incident), he learned that there was an inside plan to have Nanako eliminated, so he left the CCC with her in order to protect her. He also decided to put his unhealthy habit of taking pictures of her behind, and become her real friend.

Appearance Edit

Kenichi is a teenager who is below average build and height for his age. He has short ear-length, beige-colored hair which is styled into a style that resembles a bowl cut. His bangs cover his forehead and frame his face. He wears rectangular glasses which he wears over his light-green colored eyes.

After the timeskip, he seems to have developed a more mature face, and a taller and slightly more muscular build. He also grew his hair out, to about shoulder-length. His bangs also grew longer and frame his face more than before.

Gallery Edit

Kenichi's post-timeskip appearance, without his glasses.
Kenichi's full appearance in the anime.

Personality Edit

Trivia Edit

  • He is the youngest member of the CCC, being only 16 years old.
  • Kenichi developed the thermography scope Zero Seven used, as well as a GPS tracking system used to track CCC members.


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Characters of the Devils Line Series
Main Cast
Yuuki AnzaiTsukasa TairaJohannes KleemanAkio KanoJuliana LloydTakashi SawazakiToshiro SakakiRyusei Yanagi

Keio University
Teachers Keiji Ochiai
Students Miwako TodaShouta AkimuraTsukasa Taira
MPD Public Safety
F Squad Juliana LloydMegumi IshimaruRyusei YanagiTakashi SawazakiYousuke AsamiYuuki Anzai
A Squad Kirio KikuharaYoshiyuki Uno
B Squad Takeshi Makimura
C Squad Masakazu TakimotoNaoya UshioYusuke Kaga
Others Aya ShinjoKaname Yukimori Kenichi Morisawa Shizuka MahcidaTadaya Hiruta

Active Members Kaname ShiraseKirio KikuharaNaoya UshioAkihito KanzakiYuriko Hyuga
Former members Kenichi YoshiiKouhei Nakamura Mayu SumimoriMegumi IshimaruNanako TenjoRen Murakami Takeshi Makimura

Research Haruto MinegishiJulius KurtzMasami KomatsuIbuki Takeya Midori AnzaiTamaki Anzai
ONLO Johannes KleemanTadaya HirutaYuuki AnzaiYuuko TamaruKubo
R2PC Kaname ShiraseSusumu Sofue

Other Characters
Civillians Akio KanoKaori SumimoriKatsuki SumimoriKousuke ChizuMakoto TamaruMana SumimoriMio SumimoriSaki SumimoriSayuri Tenjo Toshiro SakakiYasuhiko TakeyaYuzuru Kikuhara
Bar Cross Minami Okino
Bar CALM Kiwako Oe Ryunosuke KatagiriWataru Akase
Meteorology Plus Yuichi UtsumiYuriko Hyuga
Asahi Railways S.S TamiyaYousuke NakamuraYoriko Narumi
Shirase Hospital Akihito KanzakiFeng Jing