
Sei Ashina was born Igarashi Aya, and assumed the stage name Sei Ashina. Prior to her acting career, Ashina was a model. She made her acting debut in the 2002 TBS Television series The Tail of Happiness (しあわせのシッポ), modeling that year in magazines including Shogakukan's CanCam and Shueisha's Pinky, and was best known for starring as Hime in Kamen Rider Hibiki. She was also known for her role as The Girl, an unnamed concubine, in Silk (2007).

Kamen Rider
TV • 1971

AIBOU: Tokyo Detective Duo
TV • 2002

Emergency Room 24 Hours
TV • 1999

Dr.STOЯKS
TV • 2015

Bloody Monday
TV • 2008

ST MPD Scientific Investigation Squad
TV • 2014

Yae's Sakura
TV • 2013

Keigo Higashino 3-week drama SP series
TV • 2011

Soumatou Kabushikigaisha
TV • 2012

Saru Lock
TV • 2009

The New King
TV • 2019

Natsuko Kira
TV • 2016

The Ship of Theseus
TV • 2020

Stand Up!!
TV • 2003

Kurokouchi
TV • 2013

Daisy Luck
TV • 2018

The Good Wife
TV • 2019

The Knife and the Sword
TV • 2013