While the band is established as a four-piece unit, Manako is currently the only named member.
- Komori Manako (Guitar, Vocals)
Killmilky's formation was announced on twitter on July 7th, 2020, and the music video for their first song, "yugato" was published the same day.
On September 20th, killmilky released the music video for "Hakuchuumu".
In late January 2021, killmilky opened a crowdfunding campaign to fund their first EP. By its second day, on January 26th, it had surpassed its goal of 300,000 yen.