In Futariuum's Gate, Maya believes her life has reached a low point, with worsening social anxiety and academic struggles leading to a cycle of constant, unproductive habits. However, things take an unexpected turn when the fates reveal her true destiny: to become an agent of Heaven, wielding a formidable futa cock as her magical instrument. Her journey involves battling demons from Hell threatening the human world. Join Maya on her quest for mental health, self-discovery, and intense sexual encounters, encountering various intriguing characters along the way!