Once... I blindly believed a rumor and wound up hurting people, so I'm trying to find healthier ways to satsify my curiosity.

—Onodera to Kaguya Shinomiya, Vol 18. Chapter 172, Page 17

Rei Onodera


Kanji 小野寺 麗
Rōmaji Onodera Rei
Gender Female
Age 16
Birthday May 17
Eye Color Blue
Hair Color Pink
Grade Freshman (1-B)
Personal Status
Relative(s) Unnamed Parents

Unnamed Younger Brother
Unnamed Younger Sister

Media Debut
Manga Chapter 82

Rei Onodera (小野寺 麗(おのでら れい), Onodera Rei) is a supporting character in the series. She was a member of Shuchi'in's Red Cheer Team and is a classmate of Yu Ishigami and Miko Iino.


Rei has light shoulder-length hair which is stylized in loose drills. She wears the standard girl's school uniform with a woolly button up sweater. Her drill-like hair got more loose with her every appearance that the drills got replaced with wavy hair instead.


She is a fairly calm girl under normal circumstances and is fairly open-minded since she shows a passing interest in Ishigami reading light novels. When involved with the Cheer Team or the culture festival committee, she becomes far more energetic.

She is a rather intelligent girl, placing within the top fifty among her class in the second semester finals.


The eldest child of the president of a jewelry company[1], Onodera was introduced as a fellow Red Cheer Team member that Ishigami joined. During practice, she tells Ishigami that with what he did he's still living without a care. Hearing Ishigami's explanation she seems to act chill with Ishigami after that. She even comforted him after he lost the race.

Onodera appears again as a member of Culture Festival Committee. This time, she joins Iino in allowing for the bonfire event of the Culture Festival to be held by gaining public acceptance. Throughout the festival, she is mostly seen with Iino as they are both in the committee and a staff for their classes' haunted house.

During Tsubame's Christmas Party, Onodera seems to be looking out for Iino. She even offers a plain water for drunk Iino to drink.


  • Onodera is the only member of the Cheer Team whose face is visible from her first appearance.[2]
  • As of the second semester finals, she is ranked 48th among the first year students.[3]


  1. Chapter 172
  2. chapter 82
  3. chapter 105


v  e
Shuchi'in Academy High School
Faculty Adolphe Pescarolo
Third Year 3-A: GigakoPrevious Student Council PresidentTsubame Koyasu

3-B: Kazeno
Unknown Class: Mass Media Club PresidentYume Atenbo

Second Year 2-A: Ai HayasakaKaguya Shinomiya

2-B: Chika FujiwaraGo KazamatsuriMaki ShijoMiyuki ShiroganeNagisa KashiwagiSaburo ToyosakiTsubasa Tanuma
2-C: Erika KoseHayato HongoKaren KinoMomo Ryuju
Unknown Class: Mikado Shijo

First Year 1-A: Kozue Makihara

1-B: Kobachi OsaragiMiko IinoRei OnoderaYu Ishigami
Unknown Class: Koromo Shiranui

Unknown Year Daiki SatoMakiMasaru KobayashiTakkyTeppei Tanaka
v  e
Shuchi'in Academy Clubs
Archery Club Kaguya Shinomiya
Astronomy Club Momo Ryuju
Cheer Team KazenoTsubame KoyasuRei OnoderaYu Ishigami
Mass Media Club Mass Media Club PresidentErika KoseKaren Kino
Occult Research Club Yume Atenbo
Tabletop Gaming Club Kozue MakiharaChika FujiwaraGigako
Volunteering Club Nagisa KashiwagiTsubasa TanumaMaki Shijo
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