GrimGrimoire is a 2007 real-time strategy video game developed by Vanillaware and published by Nippon Ichi Software (Japan, North America) and Koei (Europe) for the PlayStation 2. A remaster for PlayStation 4 and Nintendo Switch titled GrimGrimoire OnceMore was released in 2022 in Japan, and is scheduled for a worldwide release in 2023 along with a PlayStation 5 version. The story follows Lillet Blan, a trainee witch who is sent into a repeating cycle of five days after her school is attacked by an evil wizard seeking the hidden Philosopher's Stone. The player commands units called familiars, each having strengths and weaknesses against the other, with the goal of either destroying the opponent's bases or surviving waves of enemies.