Synopsis: To Save the World, Can You Wake Up the Morning After with a Demi-Human?

Long ago, the Chosen One defeated the Demon King, bringing peace to the universe. But for Hironori Tabata, a regular high school student, this event seems irrelevant. However, rumors are spreading that the Demon King may return, and only the power within Hironori's pants can stop him. As a result, demi-human girls are trying to have his babies to ensure the birth of the future Chosen One. Hironori must choose between protecting his chastity for the girl he loves or saving the planet.