Humanity, love your little sister.

I miss the time when her younger sister Kana was fond of me.
Takashi Shiina lamented the current days when he was often ignored.
One day, his parents cut out a shocking story.
Surprisingly, he wasn't his real son... but he was his sister Kana's fiancée! ?

The definitive version of Reiwa's younger sister manga!

At his death, the great sage used the new magic he developed to reincarnate into the future. However, he was deemed to be talentless and abandoned in the forest of monsters where he was picked up and raised by goblins. To repay them, he helped them evolve and taught them magic. The story of the abandoned child who will build what would be known as the great empire of monsters.

After being reincarnated, Ars Louvent is supposed to live in a different world as a weak aristocrat. Both his physical strength and intelligence were mediocre in both worlds, but here he naturally possessed a skill called "Appraisal" that allowed him to see the potential of any person. By gathering talented people by his side, Ars uses this "Appraisal" skill to transform his weak territory into the strongest one! But the road ahead of him won't be so simple.

Tetsuya Takahashi was suddenly summoned to another world. However, his invocation was a mistake and after participating in the level review...he has the weakest [level limit], lv.1, the king seeing his limit calls him "defective" and condemns him to death! Despite being summoned against his will. Tetsuya is thrown into the valley of the monsters. There he was attacked and brought to the brink of death, and when he used his unique skill [Absorb Corpse], he gained the skills that the corpse possessed! "...Let's do it! Survive in this world, become strong and take revenge on those who were summoned. The "level 1" man who was called "defective" and "weak"... now begins the ascent to be the strongest!

alt. Raw: https://comic-walker.com/contents/detail/KDCW_MF00000430010000_68/