The Heroine is My Stepsister, and I'm her Final Boss - Chapter 81: End it.

Born as a hybrid, I was ab*sed by my maternal grandfather because I was a useless child who didn’t inherit any abilities from my dad’s family, and ended up dying.I returned to the past with my memories, but my options weren’t so different from the past.I’ll either live like this and be ab*sed to death just like in my previous life, or I’ll go to my dad who hates me.‘I don’t want to die again.’Eventually I went to my dad who hated me, with a locket in my hand that would prove me to be the daughter of the Black Leopard family.“Let me…let me stay here.”All I asked for is protection until I became an adult. Then, when I was old enough to live alone, I was going to go out and live without causing trouble. Because I was going to be a good kid this time.But, somehow…“My beloved daughter, if there is anyone who touches you, I will kill them immediately.”My father, who I thought hated me, was so sweet to me.“Hey, Perfi, don’t keep hugging Thiel. At this time of year, I heard that girls are very delicate.”“Where did you learn that s*upid theory? Thiel likes to hug.”The two brothers who I thought were scary like me so much.“Thiel, I’m going to hand you over the head position of this Black Leopard family.”My paternal grandfather suddenly tells me that he is handing over his position to me.Hey …didn’t everyone hate me?

An incredibly athletic older brother, Tenryu Taiga. A programming genius girl, Tenryu Fuyuki. The two siblings separated for eight years ended up living under one roof again after facing the problem – a lack of funds for living expenses.

Fuyuki proposes a way to earn money, a core system deeply involved in people’s daily lives, a game that awards you money as a prize for defeating malicious bugs in cyber world, the 《Aries》structure. Taiga after becoming a warrior in the game relying on his inborn senses, is puzzled by the unfamiliar sensation.

One day Saionji Rui, Fuyuki’s best friend appears and is attacked by a mysterious bug― “I’ll be waiting, my prince.”. Hybrid fantasy battle of cheating siblings begins here!

“How many people have you killed? How many families have you destroyed? How many towns and cities have fallen because of you!?”“I don't remember.”The villain whom the main character was destined to defeat at the end of the novel. That was who I had become.There was just one problem...“Why am I a teenager!?”“Why is there a school acceptance letter on my desk!?”

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates