Outside the four clans, was a clan called UnderClan. They lived in burrows, and hunted prey underground. They were literally undisturbed all the time. They were even fat during leaf-bare.
One day, two warriors, Twilighteyes and Whitestripe bring back warriors from ThunderClan, RiverClan, ShadowClan, and WindClan: Lionblaze (ThunderClan), Reedwhisker (RiverClan), Tawnypelt (ShadowClan), and Crowfeather (WindClan).
They ask for help, claiming a band of rogues recently has been killing their kits who have strayed off. Although UnderClan refuses to help, claiming that they are scared to send away warriors, Twilighteyes and Whitestripe volunteer to help.
What they don't know though, is the secrets they will find.
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!]