Ichiban Ushiro no Daimaou - Volume 9, Prologue

When Shen Xinghui, an ordinary young man, is suddenly transported to a fantastical world, he finds himself surrounded by incredible beings like Beast Man, Dragon Man, and even Demons.Struggling to adapt in a place where the rules of life, magic, and even biology are wildly different, Shen Xinghui must rely on the guidance of Ignatius, a noble Dragon Man.As Shen Xinghui learns about this world’s diverse cultures, powerful magic, and the ever-present mystery of how he arrived, he discovers that he’s not the first outsider to find himself here—and perhaps not the last.With no clear way back home, Shen Xinghui embarks on a journey to the capital of the Cindralith Kingdom, determined to carve out a place for himself in this strange yet wondrous land. Along the way, he uncovers secrets about the world—and himself—that will change his destiny forever.

Nagi who was summoned to another world acquired the「Skill Structure」skill.

Nagi felt the hints of black job from the king’s request 「To defeat the devil king」. He leaves the castle and starts his journey with a slave girl.

The small demon girl Cecyl, the melee-fighter beast girl Rita , Aine the onee-chan maid, Regii the cursed sword.

Rafiria the warm and fluffy elf and Iris the sea dragon shrine maiden.

Nagi rewrites the girls’ skills and made them into 「cheat characters」one after another.

The world is separated into three realms: Aegaryn, Terranis, and Abyssion.Terranis and Abyssion realms have been in disharmony as the Demon King of Abyssion aims to overthrow all the other realms. In the tackling of this and to help the humans of Terranis defend themselves from the demons,A street orphan becomes a sacrifice in a summoning ritual for an S-rank beast. But he is given a golden opportunity of a lifetime as he is transmigrated into a hyena. Guided by a mysterious system that helps him unlock his boundless potential, he evolves with each rank upgrade, a feat no one of his kind has ever known. His journey is one of transformation, both in form and spirit. Each evolution brings new powers and challenges as he is summoned into deadly wars, cruel betrayals, and battles that threaten the very balance of the realms.Along his journey, he meets a summoner whose kindness and ideals are a stark contrast to all the summoners that he had met previously. Unlike the others, she treated him differently. Gave him a name. Through her, he begins to question his path, torn between his primal instincts and the flickering remnants of his humanity.But as the Demon God stirs in the shadows, threatening to collapse the realms into chaos, he must rise to face his ultimate destiny. To protect those who matter, to shatter the chains of servitude, and to ascend to the pinnacle of power—Ash must embrace his boundless evolution and become a force unlike any the realms have ever seen.

Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.

-Do you think that your fire is very powerful? I have the burning fruit.

-Do you think that your thunder is very powerful? I have a thundering fruit.

-Do you think that your otter is very powerful? I have the frozen fruit.

-Did you said you want to die? Don’t worry, I also have a nickname: Death Doctor.

- Description from Novelupdates