The Bride Of The Devil - Chapter 38: When The Devil Loses His Mask

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

In a future timeline, the earth was visited by a species known as the Slarkovs.
Having lost their home planet and in search of a new one, earth was the next habitable planet for them.

Humans and Slarkovs made a deal with each other in return for the Slarkovs living on earth.
The Slarkovs traded their technology and knowledge for a new home.
They were similar to humans except for some of them who had slight differences so fitting into the society wasn't a problem.
Over the years Slarkovs and humans began to mate with one another and reproduce offsprings.
This in turn created a new species known as the mixed-blood.
Centuries later mixedbloods could tap into their bloodline and perform unimaginable feats.

Gustav born into an age where bloodline determines everything, struggles to fit with a useless bloodline.
His bloodline only grants him the ability to change his hair color, destroying his hopes and dreams for a great future.
His fate is turned around when an unexpected situation leads to him finding a system that grants him the power to unlock and upgrade bloodlines by completing quests but he's baffled by two quests with a five-year deadline. Success will grant him unimaginable rewards...
But only one thing awaits him if he fails... Death!

Follow Gustav on his interesting journey filled with unprecedented adventures, danger and death, maybe?

Driven by his need for revenge, Lazarus, the Lore’s most ruthless vampire, plots to seize the throne of Wilyra and rule it along with his betrothed, the fae goddess Maeve who thrives in a borrowed body.

Lazarus has a perfect plan—until he finds Emmalyn, a young mortal who is the daughter of the rebel leader of blood vassals in his kingdom and an integral part of his plan. He captures the young girl to cast her soul out for Maeve.

Emmalyn yearns for a better life to escape from her stepmother and an indifferent father. She never imagined that they would sell her to the royals to save her brother’s life.

But there’s only one problem. Emmalyn tempts Lazarus beyond reason. As the time to cast her soul out draws closer, he must choose between his lust for the throne or his irresistible mortal.

Will Lazarus succumb to lust for power and crown? Or will he risk it all to have a future with her?

Escaping from the wedding she dreaded with Crown Prince, Aed Ruad, Princess Anastasia ended up becoming the captive of the Lore's most dangerous man, Prince Ileus.