|Birthdate||December 5, 1995|
|Current Age||27 Years Old|
|Social Networks||Ameblo / Instagram / Instagram / Twitter / YouTube|
|Idol Career Info|
|Former Team||1st Generation|
|Debuted||June 2011 / 1st Generation|
- Lightstick colors: Pink and Blue
- Audition Song: HEAVEN (Hamasaki Ayumi)
- She is a former member of the idol group CHIMO.
- She is proud of being from Oita Prefecture, using the local dialect often and recommending local foods.
- She graduated on April 4, 2015 (Announcement: February 5, 2015).
- After graduation she released a solo single, becoming the second Nogizaka46 member to debut as a soloist (after Yamato Rina a few months prior).
- She got married on the autumn of 2017 to a non-celebrity from Yamaguchi prefecture.
- First mother of Nogizaka46
- On June 5th 2019, she announced she had given birth on June 3rd to a baby girl.
- On October 2nd 2021, she announced that had given birth to her second child, a son.
|01||SOMEDAY / Dear My Friend / This Way||2016.05.25|
Hatanaka Seira (2014 - Natsu no Free & Easy)
Hatanaka Seira (2014 - Kidzuitara Kataomoi)
Hatanaka Seira (2013 - Barrette)
Hatanaka Seira (2013 - Girl's Rule)
Hatanaka Seira (2013 - Kimi no Na wa Kibou)
Hatanaka Seira (2012 - Seifuku no Mannequin)
Hatanaka Seira (2012 - Hashire! Bicycle)
Hatanaka Seira (2012 - Oide Shampoo)
Hatanaka Seira (2012 - Guru Guru Curtain)
Hatanaka Seira (2011 - Nogizakatte, Doko?)
Hatanaka Seira (2011)