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★It has been published as a book by Tsugikuru Books. Volumes 1 and 2 are now on sale! The comic adaptation is also currently being serialized.

★Gray Millard was born as the third son of the Millard family, the poorest noble family in the empire.

In the Millard domain, his wicked stepmother has turned his biological father, the lord, into a puppet, and imposed tyrannical rule.

Gray, who dislikes trouble, immediately decides to leave the territory. Ignoring the suffering residents under tyranny, he intends to dedicate himself solely to self-improvement until he turns thirteen, when his parents' guardianship expires, but...

This is the rise-to-power adventure story of a person with the body of a child and the mind of an old man.

★The illustrator is none other than Mitsuba-sama! A must-read for fans, so please pick up a copy!

The content, from characters to story, has been significantly revised from the web version, so even those who have already read it will surely enjoy it.

The web version will also continue to race towards its conclusion in parallel without stopping, so please look forward to it.

Finally, we owe the book's publication to all our readers. We sincerely thank you from the bottom of our hearts.

★It is also serialized on Kakuyomu. The address is below.

https://kakuyomu.jp/works/16816452218343556730

	The Rise and Fall of a Child's Body and an Old Man's Mind (Tsugikuru ... Amazon.jp https://www.amazon.co.jp › Body... An old man in the form of a child revolutionizes another world. This fantasy story of a rise to power in another world, using the powers of magic and science, begins now! A mysterious old man, Sagami Shirabe, suddenly finds himself transported to another world...
	The Rise and Fall of a Child in Body and an Old Man in Mind (Riki Mizu) Kakuyomu https://kakuyomu.jp › works Chikara Mizu · ☆25,511 · Isekai Fantasy. 413 chapters in progress. Updated October 10, 2025. To conclude the story of the frail high school student, the series will resume on Kakuyomu! The alternate world story of a frail high school student who becomes the strongest in the world...
	The story of a man's rise to power, with the body of a child and the mind of an old man Become a Novelist https://ncode.syosetu.com › ... The story of a child's body, an old man's inner self, and his rise to power. Author: Chikara Mizu. ☆Published by Tsugiku Books. Volumes 1 and 2 are on sale now! A comic book adaptation is also currently being serialized. ☆Empire...
	The story of a man's rise to power, with the body of a child and the mind of an old man Niconico Manga https://manga.nicovideo.jp › comic The story of the rise of a man with the body of a child and the mind of an old man. Author: Chihiro (illustrator), Tsugikuru (original story), Mitsuba (character design). Read from the beginning. Sagami Shiro, a brilliant old man...
	The Rise of an Old Man with a Child's Body and an Old Man's Heart 2 (Tsugikuru Books) Goodreads https://www.goodreads.com › show The second installment of the fantasy story of a man in the shape of a child revolutionizing another world with the powers of magic and science! After the Goblin Incident, the Sagami Trading Company...
	"The Story of an Old Man's Rise to Power" series (Tsugikuru Books) Book Walker https://bookwalker.jp › series The latest volume in the "Child's Body, Old Man's Mind's Rise to Power" series (Tsugikuru Books), author: Chikara Mizu, illustrator: Mitz Vah, new literature.
	The story is about an old man's rise to power and adventure, and Satera joins in! Kadocomi https://comic-walker.com › detail 22 Nov 2023 — [Episode 0: Gray Millard] The Rise and Fall of a Child-like Man with an Old Man's Mind. Satera's Going Along! Follow. Yu Ouchi (Manga) / Chikara Mizu (Original Story) / Mitz Vah (...
	The Rise of a Child in Body and an Old Man in the Heart 1 Comic Seymour https://www.cmoa.jp › title Sagami Shirabe, a cool-headed genius scientist, is reincarnated as Gray Millard (8 years old), the third son of an impoverished noble family in another world. However, his evil stepmother has brought chaos to his territory, and it is on the verge of collapse, making the situation the worst possible.
	The Rise and Fall of a Child in Body and an Old Man in Mind / by Riki Mizu / Mitsuba ... Kinokuniya Bookstore Webstore https://www.kinokuniya.co.jp › ds... A much talked about work that has already been decided to be made into a comic! A fantasy story about an old man in the form of a child who revolutionizes another world using the powers of magic and science, now begins!
	The Rise of a Child's Body, an Old Man's Mind 3 (Tsugikuru ... Amazon.jp https://www.amazon.co.jp › Body... With the belt removed, the two resume Gray's journey. The third installment of the fantasy story of a rise to power in another world, harnessing the power of magic and science!

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The story of a man's rise to power, with the body of a child and the mind of an old man

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