Reina Koseki

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Reina Koseki
Reina SS.png
Character data
Name: 小関麗奈 (Koseki Reina)
Voice actor: Unvoiced
Age: 13
Height: 148 cm
Weight: 36 kg
Birthday: March 5th
Blood type: B
Three sizes: 75-50-77
Handedness: Left
Hobbies: Pranking
Horoscope: Pisces
Hometown: Yamagata
Card Type: Passion
Image Color:     
Reina sig.png

Reina Koseki (小関麗奈 Koseki Reina) is one of the characters available in THE iDOLM@STER: Cinderella Girls. Her basic card is Normal. She received three Rare card sets, a Rare+ card, and four S Rare card sets with the titles "School Devil", "Royal Joker", "Magical Girl Flame", "Mischievous☆Queen", and "Marching☆Loudly".


Annual Rankings

Event Prelim Rank Final Rank
1st Anniversary Election Unranked Unranked
2nd Anniversary Election Unranked Unranked
3rd Anniversary Election Unranked Unranked
Voice Idol Audition Unranked Unranked
4th Anniversary Election Unranked Unranked
5th Anniversary Election Unranked Unranked
6th Anniversary Election Unranked Unranked
7th Anniversary Election ? ?
8th Anniversary Election ? ?
9th Anniversary Election Not applicable ?



"さぁ行くわよ、○○! レイナサマがナンバー1アイドルになる手伝いをできるなんて、アンタ運が良いわ。後世まで語り継ぎなさい。愚民共がアタシの前にひれ伏す日が楽しみね! アーッハッハッ…ゲホゲホ"

Character Description

Reina is a foul-natured girl who condescends over others. She is a prankster and backstabber, and rarely shows regret for it. She is the closest person to being "evil" among the Cinderella Girls characters, although this really means she's just a bit more confrontational than the typical idol. With her boast of "I am the Queen of Evil!", she enjoys watching others getting pranked or laughing at their misfortune. She tends to do things for seemingly no reason other than that she enjoys being spiteful. She carries a megaphone everywhere, and always wears a hateful scowl.

Despite her attitude, she avoids pranking idols younger than her and does not intentionally prank anyone to cause physical harm or property damage. Because of this, it's surmised that a lot of her behavior is due to lacking social skills and wanting attention. She has to be coerced into apologizing for her behavior, and never seems to get into serious trouble when caught. She is depicted as having only one or two friends, namely being Sachiko Koshimizu or Hikaru Nanjo.

In the tie in Cinderella Girls Theater skits, Reina is quick to bully and antagonize her fellow idols. She constantly plans ways to hurt the other idols, ranging from simply laughing at others mistakes to launching bazookas at a room full of girls. Some of her bullying attempts include teasing Riina Tada for wearing a cute costume, speeding up Sana Miyoshi’s running machine, scaring Koharu Koga while jump roping, and shooting Yoshino Yorita in the face with a water gun while she was trying to concentrate.

Reina is easily angered and embarrassed, especially if her plans fail. She was tricked by Azuki Momoi into wearing a cute costume and vowed that she would never do it again. Chinatsu Aikawa also forced her to learn that she shouldn’t do things to others if she isn’t willing to take them herself. Reina earned a role in Chika Yokoyama’s magical girl TV show as the Magical Maiden. She is training partners with Sana Miyoshi and Koharu Koga. Reina also discovered Tsubaki Egami’s photo taking abilities, and attempts to bribe her into using her photos for blackmail.


Basic Quotes

After Training

Other Quotes


Character Gallery


THE iDOLM@STER Cinderella Girls: Starlight Stage Cards