Hoshino Riko

 (星野梨心) was a member of Chat NoiR.

She is presumably on hiatus since April 3 2021, after missing all promotions of the group since then but still being listed as a member on Social media.

During her hiatus the company announced that Riko would graduate from the group around the end of may without disclosing the exact date, however as of june 2021 she still has to graduate.

She graduated without a ceremony on summer 2021.