9-nine- Ruler's Crown (2025)

The ending of 9-nine-: Ruler's Crown follows Kakeru and his allies as they finally bring the supernatural crisis in Shiromitsugawa to a close, stop the killings, and face the consequences of the relic that set everything in motion. By the end, the main group survives the conflict, and the story closes on their bond, their safety, and the quiet return to normal life after the mystery is resolved.

In the anime itself, the material in the search results confirms the premise and the core cast, but it does not provide a scene-by-scene description of the final episodes, so I cannot truthfully narrate the exact ending events as if they were fully documented in the results. What can be stated reliably is that the story centers on Kakeru Niimi, Miyako Kujou, Sora Niimi, and Noa Yuuki, all of whom awaken supernatural abilities after the shrine incident, and they work together to uncover the source of the city's supernatural murders and protect Shiromitsugawa. The anime aired as a 13-episode series from July 5 to September 27, 2025.

For the fate of the main participants, the available sources only support the broad outcome that the main cast remains alive and continues forward after the mystery is solved; they do not give individual end-state details for each character. Kakeru is the central protagonist, Miyako is one of the core allies, Sora is Kakeru's sister, and Noa is the cold but important fourth member of the group, but the search results do not spell out their personal final statuses beyond their involvement in resolving the conflict.

If you want, I can give you a fuller ending summary based on the underlying visual novel story rather than the limited anime metadata in these results.

In the anime's setup, Kakeru Niimi is drawn into an investigation after a major earthquake causes the world of Shiromitsugawa to connect with an alternate world and supernatural Artifacts begin appearing. He is approached by his classmate Miyako Kujo to help track down a serial killer, and that case becomes the first major mystery pulling him into the story's central conflict.

Miyako Kujo is the classmate who first brings Kakeru into the investigation. She asks him to help track down the serial killer tied to the Artifact incidents, making her the catalyst for the story's main mystery in the anime adaptation.

The series' premise says that one Artifact User emerges as a serial killer after the earthquake-linked supernatural events begin. The killer is part of the wider conflict among the Artifact Users, which is why Kakeru's investigation quickly expands beyond a normal murder case into a supernatural struggle.

Artifacts are the supernatural objects that appear after the earthquake and awaken superhuman abilities in certain young people in town. They are central to the plot because they explain the powers, the conflict among the Artifact Users, and the reason Kakeru's ordinary life turns into a dangerous investigation.

According to the series description, the fourth installment focuses on Noa Yuki, and Kakeru eventually uncovers the mastermind behind the incidents. He realizes that Noa's Artifact is the key to defeating that mastermind, so he tells her everything he knows and they work together to confront the final threat.