TheirSide is a browser-based space for private conversations with fictional AI characters. Start 1:1, create a custom character, or bring up to four AI characters into one room, where later replies can use the shared conversation as context. Story scenes add a common setup for role-driven exchanges. No install is required, and a signed-out Mio + Kai demo plus a Free plan make it easy to try. Built for fictional entertainment and creative exploration—not multi-human chat or therapy.
