Grimms Notes (グリムノーツ, Gurimu Nōtsu) was an online free-to-play role-playing game developed by Genki and published by Square Enix. It was released in Japan on January 21, 2016 for Android and iOS devices. The game was released worldwide on March 2, 2018 in South Korea, China, North America and Europe by Flero Games, a Korean publisher. An anime television series adaptation by Brain's Base, titled Grimms Notes: The Animation, premiered from January 10 to March 28, 2019; the anime series is licensed in North America by Sentai Filmworks.
The game ended service on June 17, 2020. It was planned to end service on April 30, 2020, but the date was delayed due to COVID-19 pandemic.