Tangerines and Watermelons

"Reincarnated into the World of Magic as a demon, the last thing Davis expected was to grow up right amidst the arms of angels. Ever since the group of philanthropic angels took pity on his miserable birth and adopted him, Davis has been forced to keep his evil identity a secret while he signed in to the system. 
""Ding! The Host has signed in at Angel's Pond, 'The Saint's Halo' is rewarded!"" 
""Ding! Devil's blood activated. Sign in error. 'The Devil's Curse' is additionally rewarded!"" 
""Ding! The Host has signed in at God's Throne, 'Gold's Holy Axe' is rewarded!"" 
""Ding! Devil's blood activated. Sign in error. 'The Devil's Manifistation' is additionally rewarded!"" 
After a thousand years of quietly signing into places in the City of Angels and being rewarded with double the rewards, Davis's true identity finally came to light! Now as a true Devil, Davis had both the world of angels and demons surrendering at his feet!"

EndlessFantasy Translation 

After Transmigrating as a Demon, I've Been Adopted by Angels!

Waynec94

Chubbania_EFT

However, as his research on Davis' bloodline deepened, the shock in Vontel's heart grew stronger.

He discovered that Davis' bloodline seemed to be many, many levels higher than his.

However, when Davis injected into the bodies of the angels, the dragon warriors, the fallen angels, and the two humans, Vontel was completely convinced that Davis' bloodline really had supreme power.

It was that power that caused all the angels, the dragon warriors, and the two humans to transform.

It allowed them to easily break through the realm of the seraph.

That was an achievement that was very difficult to achieve in the world they were in now.

Previously, even among the archangels in heaven, only Uriel and Sariel had surpassed the realm of the seraph.

Among the Dragon Race, only the Dragon Queen had reached the realm after the seraph.

Originally, the seraph was the peak of this world.

I am a Slow Learner!