The agency of the voice actress Runa Narumi announced hiatus due to her poor health. The agency also apologized to the fans for the inconvenience caused and asked the fans to refrain from making any sort of inquiries to the related parties.
Runa voices the character Yuika Mitsumine from The Idolm@ster Shiny Colors. The official website of the franchise announced that the voice actress will not appear in the Idolm@ster Shiny Colors 283 Fes 2021 Happy Buffet! event. In spite of this, the event will continue as planned from October 23 to 24. The website also stated that they will not be accepting refunds due to changes in performers.
The voice actress also voices Erika in the mobile game Konosuba: Fantastic Days which became available to download globally this August. Nexon is in charge of the development, and the game had its release in Japan back in February 2020. The mobile game can be downloaded on iOS and Android devices.
Runa was also a member of the voice actor unit Sound Orion. The unit announced that she will no longer be part of the group on October 18.
Source: Stardust Promotion Official Website, Idolm@ster Official Website, Sound Orion Official Website