[Naruto] Better to Ascend to Heaven Than Conquer the World

Also known as "The Industrial Revolution Caused by Three Vernier Calipers."

Young Tobirama woke up one day to find he had gained a second shadow. More precisely, someone else's consciousness had moved into his mind: an academic-obsessed girl from another world, the kind of top student who could get a perfect score on the Jiangsu College Entrance Exam.

One of the four ideas from the Founding Era group, long in the making: the two souls in Hashirama Senju trope.

Here's a preview of the blurb.

Theme: