Katerina Walter lived her entire life thinking she was normal. She grew up in a normal home, with normal parents, she attended a normal school and she had normal friends. Until one day, on her thirteenth birthday, she receives a letter that reveals that everything she thought she knew about her life was a lie. Katerina realises that the normal parents she thought she had, weren't her parents at all, and they were not normal. The normal home that she had grown up in was not at all what she once thought it was, and there were many secrets hidden beyond the walls, including the fact that she has a twin brother. Within the letter, it is unveiled that past all of the regular people, and behind the plain schools, there is a world of magic, just waiting to be explored.
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!]