A few years ago, a virus spread in a global pandemic and affected all men – apart from ordinary high school student Itsuki. The virus causes incurable erectile dysfunction in those affected, making Itsuki the last man on the planet who can still get a hard-on. To avoid attracting attention and ending up as a government guinea pig, he wants to keep his abilities a secret at all costs, but as he has transferred to a school that pretty female students almost exclusively attend, this is not exactly easy. So it’s not long before the first female classmates get wind of it and want to use his best piece for their own purposes. In a world with four billion Evas willing to mate, the one and only Adam doesn’t have it easy...