When man-eating Titans rule over what's left of humanity, it's up to mankind to find a solution. General Pixis (Pyxis), a high order under the king himself, is asked to train childish misfits into humanity's strongest elites in just a few short years.
Katherine Lionheart somehow finds herself as one of them and is now the current and acting commander of what is now known as the great Ark Army. Five, separate, generations of outrageous adults who can see their worth and finally fight for the greater good outside the walls.
However, when the Ark Army is summoned into Wall Sina with an objective to aid the king and Military Police in optional training, none of her soldiers expected a titan to breach Wall Rose, a boy that can transform, and a captain who adores tea and cleaning.
When Katherine finally meets Captain Levi, it's uncertain to many what would happen. With her hard head of ideas and stubbornness and his knack for belittling others and not heading authority, it's no surprise they can't stand each other's presence.
Love works mysteriously in many ways, and can control every little thing you do, but only if one knows it.
And not surprisingly, neither of them know it.
Transmigrated into DxD World-Kuoh Town, Hibari Kyoya. an average student, spent 18 agonizing years in the world fully aware of the dangers, knowing he is utterly powerless in a world of gods and monsters, Until...
[Ding! Sign-In System loading... 20%... 50%... 80%... 100%.]
Destiny, it seems.. has a cruel sense of humor. A [Sign-In System], long overdue, finally bursts to life within him, offering a chance at survival, a chance at power...
[Ding! Congratulations! You have received the Rainbow-Grade Gift Bag!]
...
He then started completing System's tasks, accumulating even greater rewards.
[Ding! Task completed. Reward: Perfect Rumble-Rumble Fruit (Weakness to water Removed).]
[Ding! Task completed. Congratulations to the host for obtaining the Flying Thunder God Technique!]