Light Novel (Other) The body is a child, the inside is an old man's rising adventure story Tsugikuru Books

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

The mysterious old man, Sagami Shirabe (Shirabe Sagami), suddenly reborn as Gray Millard (8 years old), the third son of the Millard family, a poor aristocrat of a different world. The territory of Millard was kept in tyranny by his Gedo mother-in-law, and it was on the decline. Gray, who was disliked by his family, decided to leave home at the age of 13 when his parents' right of custody expired. He made a special bonus when he reborn to become independent. He uses his knowledge of techniques before rebirth, such as "magic blueprints," "ring area," "universal item box," and "universal transition," to concentrate on self-polishing, but his insane power will change the other world greatly.