|Birthdate||September 19, 2001|
|Birthplace||Baguio City, Benguet, Philippines|
|Current Age||21 Years Old|
|Social Networks||Instagram / Instagram / SHOWROOM / TikTok / Twitter / Twitter / YouTube|
|Idol Career Info|
|Former Team||Team KII|
|Debuted||November 2019 / 10th Generation|
Igarashi Hayaka was a member of SKE48's Team KII.
- SHOWROOM Audition Number: #66
- Hobbies: Cosplay, sleeping, sky-diving.
- Special skills: English conversation.
- Future dream: Before a person with presence.
- Favorite food: Ramen, katsudon, adobo, melon bread
- Favorite word: Sono hi wo tokoton tanoshimu
- A short message: One step in a time, I'll do towards my dream, so please support me!
- Failed MNL48's 1st Generation auditions
- Was part of the Philippine-based idol group Aidoru Sozai under the name "Hayayan"
- Her official profile says her birthplace is Saitama, Japan, which goes against her claims during her activity in the Philippines and audition
- Joined SKE48 as a member of its 10th Generation.
- On January 15th, was part of her first song, Nagisa no Image, on SKE48's 26th single, So~Yu~Toko Aru Yo Ne?.
- On February 3rd, was part of her first senbatsu, for SKE48's 27th single Koi Ochi Flag.
- On December 19th, promoted to Team KII.
- SKE48 Kenkyuusei → Team KII → Graduation
- Joined SKE48 as a Kenkyuusei on November 19, 2019
- Promoted to Team KII on January 15, 2022 (Announcement: December 19, 2021)
- Graduated from SKE48 Team KII on February 28, 2022 (Announcement: February 15, 2022)