WILL-O'

 is a rock idol group formed in 2018. The group was previously known as Alloy.

They were set to be ending their current system on January 23, 2021 with all current members graduating from the group, however their final performance has been delayed until March 2021 due to COVID-19 restrictions.

Final Line-Up

 * Enomoto Ryo (榎本りょう; ) (Original Member; Graduating January 23, 2021)
 * Komori Uzura (小森うずら; ) (Original Member; Graduating January 23, 2021)
 * Kirino Miyu (桐乃みゆ; ) (Original Member; Graduating January 23, 2021)
 * Saeki Tsumiki (佐伯つみき; ) (Joined July 7, 2019; Graduating January 23, 2021)

Former Members

 * Sato Yuni (佐藤ゆに; ) (Original Member, Withdrew April 2, 2019)
 * Kanzaki Nono (神崎のの; ) (Original Member, Withdrew August 23, 2019 due to poor physical condition)

EP

 * 1) [2018.12.24] Jump! -Member Solo ver.-

Major Singles

 * 1) [2019.06.04] Kanjou Sensome Hikari Emotion (感情線染ヒカリエモーション)
 * 2) [2019.12.01] HANABI
 * 3) [2020.08.17] Baby's Breath

Digital Singles

 * 1) [2018.12.24] Jump!
 * 2) [2019.01.21] Innovator
 * 3) [2019.01.21] Last Dance
 * 4) [2019.02.28] Stardust Memories
 * 5) [2019.03.18] Identity
 * 6) [2019.04.01] Renshin Clumsy (恋心クラムジー)
 * 7) [2019.04.07] SPARKING
 * 8) [2020.05.31] I Will Hope