Paradox of Gemini

Paradox of Gemini is a Japanese adult science fiction visual novel which takes place across multiple dimensions. Throughout the game, the player takes control of both Souichi and Souji Moroboshi, two apparent twin brothers who seem to have a synchronicity with each other. They both attend Eiman Gakuen, a school which hosts a program for students with extra-sensory abilities, with four other members of the program being their childhood friends Haruki and Natsuki Kasuga, Souichi's ex-girlfriend Ao Watarai, and the genius Tesla Yamamoto. One day, the school is thrown into chaos when a disaster causes it to be lost in another dimension, with Haruki and Tesla being left in the prime dimension with Souichi, and Natsuki and Ao being trapped in the other dimension with Souji.

Throughout the game, the player makes decisions as Souichi and Souji which may cause the story to branch into different routes and result in different endings. Choosing poorly at certain points may result in a bad ending. The game contains a flowchart to help the player navigate the game, which has an enforced playing order for some of the routes.

The Windows version includes sexual content which was omitted from the PS Vita version.