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Igarashi Hayaka (五十嵐早香) is a Japanese pop singer and idol. She is a former 10th generation member of SKE48.
- Name: Igarashi Hayaka (五十嵐早香)
- Nickname: Mumuchan (むむちゃん)
- Birthdate: September 19, 2001
- Birthplace: Baguio City, Benguet, Philippines
- Hometown: Saitama, Japan
- Blood Type: B
- Height: 158cm
- Hobbies: Cosplay
- Specialties: English conversation
- Bands / Groups:
- Aidoru Sozai (2018–2019, as Hayayan)
- SKE48 (2019–2022)
- SKE48 Kenkyuusei (2019–2022)
- SKE48 Team KII (2022)
SKE48 Song Participation
|Souyuutoko Aru yo ne?||Nagisa no Image||SKE48 10 Kisei|
|Koiochi Flag||Koiochi Flag|
|Ano Koro no Kimi wo Mitsuketa||Sekai no Superhero|
|Kokoro ni Flower||Janai Romantic|
- Currently a tenth generation Kenkyuusei member as of November 19, 2019, she will be promoted to Team KII on January 15, 2022. Her graduation was announced on February 15, 2022, and she graduated on February 28th.