Giantess attack

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. There is another weakness if you manage to get inside them you can kill them from the inside but this is an almost impossible task. 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.