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The game originally launched on Steam on November 1, 2021 and has received a series of updates over the years. After launch, the developer shipped a "100 consecutive calls" gameplay mode on December 29, 2022, and added various quality-of-life features through 2023. In August 2024, the developer announced plans to add a prequel story focused on characters Ars and Memento, alongside a multiplatform release targeting early 2025. On June 6, 2025, the game launched on Nintendo Switch, Xbox Series X, PS4, and PS5 through publisher KEMCO — marking the "complete edition" multiplatform release. Notably, the director's June 5, 2025 post explicitly states that no new scenarios or illustrations were added to this release, and explains why: the director found it too difficult to write a new scenario despite multiple attempts. The post also explains that any new story content (a prequel focusing on Ars, Memento, and Vanitas) is being reserved for a separate sequel, not the current game. The earlier October 2024 announcement had promised a prequel story and new event illustrations as a free Steam update alongside the multiplatform release, but the June 2025 post supersedes this — the director confirmed those additions were not included due to creative difficulties, and that content has been redirected toward a future sequel. This is the most recent developer communication, and it clearly signals that no further content is planned for this game. The multiplatform release on June 6, 2025 represents the final form of the game's content.