Gekitotsu no Hexennacht - Volume 3, Chapter 3: The Relief of Simply Watching Over

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?

He woke up in a familiar world that had vastly changed.

His familiar school had become a mystical school that teaches magic, encouraging everyone to become a mighty magician.

Outside the city, many wandering magical beasts and monsters attacked and preyed on humans.

His world of advanced science changed into one that praised magic. Despite this, his ambition in life, and his social status remained the same; one of the dregs of the society with a struggling father and a disabled step sister that couldn’t walk.

However, Mo Fan found that when most people could only practice a single major element of magic, he was a Versatile Mage!

People say that when a man becomes middle aged, their appearance and energy will become weak. Ye Qing Xin doesn’t feel that way. At least Jing Bo Yuan is not, his appearance and energy is still really great.

Jing Bo Yuan refuted: I am just thirty five years old, it’s still a long time untiI I reach middle age.

…

Jing Bo Yuan, born in a rich family, he establishes Bo Wei company, he is a great one in the business world.

Everyone thinks he is: mature, serious, strict, and fathomless.

That kind of strict, serious, and successful man, suddenly does romance with a younger woman. He marries a young wife, who is younger by fourteen years old compared to him.

Ye Qing Xin, is a little girl that leads a wandering life. She suddenly married to an old and well-known family and becomes the object of jealousy of everyone.

…

According to the gossip, Mrs Jing is a vixen that hooks with her pure of heart and few desires. She makes the strict Mr Jing falls in love with her.

Another gossip, Mr Jing spoils his young wife without any limit.

During an interview.

Interviewer: “It’s known that Mr Jing at first to marry Mrs Jing because of her young age and beautiful face, is that right? Except her beauty, is there any good point about her?”

Jing Bo Yuan: “I love her. I don’t care whether she is beautiful or not. I married her. She doesn’t need to have any good point. Falling in love with me is her greatest good point.”

The interviewer is surprised and asks: “Mr Jing and Mrs Jing, when was your first meeting? How did you get to know each other?”

Jing Bo Yuan: “Our first time meeting was fifteen years ago…”

Interviewer: “….”

Fifteen years ago, he saved her. Fifteen years after, he gives her a life.

……..

Twenty one years old Ye Qing Xin became the most loved one in the Jing family.

Old Madame Jing: “Xin Xin ah, hurry up and drink this bowl of bird nest.”

Old Mister Jing: “Xin Xin ah, this jade bracelet from our ancestor is for you.”

Papa Jing: “Xin Xin ah, this card is for you, you can buy everything you want, don’t be too modest.”

Third uncle of Jing: “Bo Yuan, don’t you bully Xin Xin, if so I and your Third auntie will not let you off!”

Third auntie: “Em Em Em!”

Second Uncle: “I don’t have anything, I will just send you a special bodyguard.”

Ye Qing Xin: “…..” I’m just pregnant, why are they doing all of this?

- Description from Novelupdates

The story is about a man whose compulsive tendencies make it impossible for him to keep a job, and a young girl who skips school and loves insects. The two meet, come to support each other in reintegrating into society, and fall in love. There’s a problem, however: namely, the parasites in their heads.