After a wild night of drinking, 19-year-old Kouta Satou finds himself in a peculiar predicament when an angel mistakenly seals the queen of the underworld inside him instead of a holy ball. With the threat of world-ending consequences looming over him, Kouta must navigate a daunting challenge: to abstain from ejaculating for a month. As he struggles to resist temptations and fend off the seductive advances of Elyse, a devil intent on freeing her queen, the fate of the world hangs precariously on Kouta's virtue in Oretama.