Subject 67341 was the first ever human to receive the happy vaccine. This is an injection promoted as a cure for human suffering. It suppresses the genes that release any negative emotions leaving you social and happy in life. Subject 67341 after deciding she would rather die than continue with the injections is suddenly given a choice from someone she'd never expect. On the run follow subject 67341 (Eve) as she meets new and old allies. With an odd sensation called hope, Eve is determined to rid the world of the happy vaccine forever.