Karlheinz's new child... 

Yes, Ena named him Reiji.

Reji was not only a name that Ena happened to come up with. It had a bigger and deeper meaning... 

Waiting for the day the second child born, Ena also found something unusual about her Lord's first wife, Cordelia. 

It wasn't anything so big... But her glare, her expression all exposed Cordelia's true feeling. Cordelia is not only the daughter of the Demon Lord but also a First Blood. It explained why Karlheinz married her. 

Karlheinz viewed his wives as test subjects for his experiments in creating a new race, and also his sons from them too. He used everything to his advantage and viewed his family solely as tools for his utopia goal of a "new race" that he wanted to replace the current demons with, in the Demon World, believing this is the only way for that world to be "saved".

That said, to push her to give him children faster, he took a second wife to force competition on her.

'Congratulation, my Lord. It looks like everything goes according to your plan.' 

Ena herself assumed that when she saw Cordelia coming to Karlheinz's chamber alone at midnight. Hmm, she would expect no less from a woman like Cordelia...

If she gave birth to her children, the First Blood would also run through their veins. It also meant that one of her children would have the right to become heir as he was the son of the first wife.

However, Beatrix had Shuu as the eldest son of the family, reassuring her that Cordelia would not get what she want.

But Reiji, as she named him, what would he have? 

The title 'eldest son'? - No

The son of the first wife? - No

First Blood? - No

From the beginning, Reiji would have nothing as... 

"Rei" in his name meant Zero.

It might be cruel to him but that's how the world works.

Ena could not foresee the future but she could know what might happen... 

A few years after the day Reiji was born, he would become quite more mature than a kid in his age.

Since his ambitious and stoic mother, Beatrix, wished to usurp Cordelia's station as Karl Heinz's main wife, she focused on her firstborn son, Shu, and neglected Reiji despite his ambition and achievements. Beatrix would only encourage Reiji to study in order to become a better servant for Shu when he inherits the throne.

But... it would still be an uncertain future... Reiji Sakamaki, the little pitiful vampire, at the very least, Ena thought she could give him something.

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BONUSSS!!! ( 26/2/2020) Hope you guys will check the video :v

https://youtu.be/800uTw_7A1Y

Translation: Reiji's childhood ~ LOVE AND SORROW

The video belongs to Diabolik Lovers Vietnam

Beatrix: " Shu! You are the eldest son; and therefore, the next head of the family."

Reiji: " Mother, I have finished memorizing this entire book."

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" I always held on to the hope... that the one to kill me... would be you."

" Until the very end, you can still smile?" 

" I won't allow my mother to have such a peaceful death!"

" How can I accept that!"

. . . Skip the scene between Reiji and Yui , you can check it later on the anime . . .

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Cordelia: " Beatrix didn't seem to love you as much as she loved Shu, her eldest son."

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Yui: " Now, no one will get hurt..."

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Beatrix died smiling, being freed from her guilt of neglecting Reiji and putting too much pressure on Shu as well as from Cordelia's torment. " I am satisfied."