go back9 -Nine-: Episode 1
#1 The many-worlds interpretation posits that every random motion produces a novel branching universe. A butterfly flapping its wings rarely means a hurricane across the world, and human choices are no exception—our little everyday choices rarely bring about earth-shattering changes. But for Kakeru Niimi, one of those little decisions is about to make a big difference. One night, Kakeru's cheeky little sister Sora asks him to let her stay the night. And from the seemingly inconsequential moment when he caves in and says yes, a new story is born, a hurricane which will upturn both their lives. The cadre of evil users, Rig Vega. The noble crew that opposes them, the Valhalla Society. In 9-nine-: Episode 2, these two forces will collide, striking new sparks and shattering preconceived notions. Can Kakeru and Sora put an end to this unveiled threat before it destroys them both?
#2 Shiromitsugawa, a run-of-the-mill college town that has launched several failed attempts to drum up tourism and revitalize itself, including sponsoring a high-budget-but-poorly-written anime based on local folklore. A storm is about to descend on this sleepy town. We follow Kakeru Niimi, a man who can be a bit curt at times but who has a strong sense of responsibility and a kind heart. Kakeru's ordinary life is thrown into chaos after the local shrine's sacred relic shatters. In the wake of this event, several young men and women awaken to superhuman abilities. What was once a run-of-the-mill life in a run-of-the-mill town soon turns into a quest to track down a superpowered serial killer before they can strike again.
#3 Shiromitsugawa City: an academic city with no other particular features. A large earthquake hits the city, damaging the sacred treasure in the Hakuda Tsukumo Shrine, and causing strange items to appear from a parallel world. These "artifacts" grant strange powers to their owners, with incidents of an owner abusing their powers and turning people into stone. Having learned of the item that causes this petrification, the "Evil Eye Artifact", Kakeru Niimi teams up with his classmate, Miyako Kujou, and his sister, Sora Niimi, to investigate and put a stop to the culprit. During the investigation, they find themselves at odds with "Rig Veda", an organization of artifact users. Among their members, they spot their upperclassman in school, Haruka Kosaka. 9-nine-: Episode 3 is the latest chapter in this series of supernatural mystery visual novels with the focus now shifted towards a new heroine, Haruka Kosaka.
#4 9-nine- takes place in the run-of-the-mill college town of Shiromitsugawa where an earthquake breaks a sacred artifact from the Shrine of the White Serpent, unleashing jewelry-like items that bestow their holder’s special powers called “Artifacts” from a parallel world. When an incident involving a power that transcends human comprehension, Kakeru Niimi, our protagonist, investigates several branches (parallel worlds) in order to settle the matter. With the mastermind finally revealed, Sophitia, otherworldly entity set to reclaim the Artifacts, tells him to defeat this person pulling the strings. The first day, the day that the festival was cancelled due to the earthquake back at the shrine—Kakeru is now equipped with memories from every branch and is on the move to solve this conflict. Amidst this, a girl with a strong sense of justice from Kuho Girls Academy, Noa Yuuki, has an ability that seems to be the key to defeating the mastermind. Knowing this, Kakeru divulges about the events in other branches to her. All the while uncovering the secrets behind why the Artifacts come to this world, settling the scores with the Evil Eye’s User, what will be the fate of these young men and women with otherworldly power at the fingertips?