Shin Ringetsu

Just when Suzune is about to confess her love with Naoto, she falls into a comatose state due to a car crash. However, her soul resides in a toy ring that Naoto gives her. When her younger sister, Ayumi, wears it, the soul of Suzune possesses the body of Ayumi. In order to revive Suzune, Naoto and Ayumi begin to have sex and make babies to do so. He needs to have sex with Ayumi to bring back the life of Suzune or he is feeling something more than Ayumi? Will they live happily ever after if Suzune come back from her unconsciousness?