Yandere Virus turns a friendship into a co-op nightmare

At a glance

What it is: an online co-op horror game for up to four players, in which your best friend is infected and hunting you. Developer and publisher: Moka Sphere. Release: 21 September 2026 on Steam. Price: not yet announced. Wishlists: 80,000, according to the developer.

A weekend away that goes wrong immediately

Yandere Virus arrives on Steam on 21 September, and it is built on a simple reversal. A trip with friends turns into a nightmare, you wake in a mysterious place, and the friend you came with has been infected by the virus of the title. The infected friend is no longer themselves: driven by a distorted mind and uncontrollable aggression, they chase the player through a graveyard, taunting them with whispers, and being caught ends the run.

The cure is where the game turns strange. It requires Platonic Pumpkins, hidden around the map, which players must risk their lives to collect. Waiting in the same graveyard are mutated plants that attack without warning, sometimes just as the player believes they have escaped the friend.

Built by one person, in public

The developer, Moka Sphere, has been unusually open about the shape of the project. In a note closing the final Steam playtest on 17 September, the studio described the difficulty of keeping a multiplayer game stable while building it alone, and thanked testers for sending gameplay footage, logs and bug reports. Participants were asked to submit footage and log files by email, and were offered a credit in exchange.

That process appears to have worked as a marketing exercise as much as a technical one. The game passed 60,000 wishlists on 11 September and 80,000 by 19 September, the day before launch, with the developer publishing each milestone on its own Steam page. Wishlists are not sales, and they are not a quality signal, but for an unknown multiplayer horror game from a small studio they are the difference between arriving with an audience and arriving with none.

What is not yet known

There is no price, no review embargo to read into, and no content roadmap. The store page lists full controller support, Steam achievements, solo play and online co-op for up to four players, with proximity voice chat. Whether the multiplayer side holds up under real load is exactly what the final playtest was for, and the answer will not be public until the servers are.

Our opinion

Horror has spent a decade teaching players that the monster is a system, and Yandere Virus is at its most interesting when it remembers that the friend is one too. A chase you can outrun is ordinary; a chase where the thing pursuing you is a person the game told you to care about, and where the only way to save them is to keep walking deeper into the place they are hunting you, is a much better reason to be frightened. The risk is that the joke runs out fast, because relentless pursuit either becomes predictable or becomes unfair, and there is not much middle ground. What makes this launch worth watching is not the pumpkin-counting or the whispering but the wishlist number: 80,000 people have already decided they want to be chased by someone they like, and a single developer is about to find out whether that idea survives contact with an actual audience.