I won't go too much into the story cause it's a really interesting manga to look into, the main character, Kai Watari, who has the power to transform into a demonic form by drink "Ambrosia" from chosen princesses breasts (You read that right) is about to go into battle with the Yashimoto Army with the leader of Hasas, Suzuri, who releases her power causing her near non existent chest to grow huge so Kai can partake. Happens in the 2nd to last page of the chapter.
https://i.imgur.com/9l6RekP.jpg
https://i.imgur.com/F5IRdkb.jpg