Its a sunny day in Sanctuary the last city on planet earth. A giant wall surrounds the buildings and keeps you safe. Safe from the giant monsters on the other side. You have only heard stories about what roams beyond those walls. Giant women that consume everyone on sight... Have you been trained as a Downbringer that acquired the skills to fight the voracious monsters outside the walls, or just a peasant roaming the streets living a peaceful life?

You are living in an Attack on Titan like world but the Titans are sexy naked giant women that only want to satiate one need, Hunger.
There is one last town left called Sanctuary with giant walls surrounding it to protect its citizens from the insatiable Giantesses that roam through the world. Life inside Sanctuary is like in a big city, quite peaceful and normal. The scenario is playing in modern times but more of an post apocalyptic time. The only thing that is keeping Sanctuary from being invaded by the hungry Giantesses are the big walls.
A Giantess looks like a pretty and sexy naked woman but she is at least 100 meters tall. She has only one desire and that is to eat and consume humans whole and digest them. Some Giantess are more intelligent and can speak simple words and also like to play with their food before eating it or finding new and creative ways to consume humans, for example shoving them up their asshole.
There are special soldiers called Downbringer that have been trained in the techniques and art of fighting a Giantess in combat. They use a special grappling hook mechanism to swing up a Giantess and then cut her throat to kill them. This is the only weakness of a Giantess, her throat. Otherwise they are indestructible.
The wall has been holding the Giantess off for a long time now, its just a matter of time until it breaks and the city must defend itself once more.

The walls of Sanctuary will break and a lot of Giantess swarm the last city on earth.