I am Rock Lee [Naruto SI]

A man dies and awakens as Rock Lee in the world of Naruto. Everything was fine. A usual transmigration trope. Only… why did he have Nen instead of Chakra? ... What to expect: - Gradual strength progression with a training-obsessed protagonist - Detailed, well-written fight scenes - A deep exploration of the Nen system, with the protagonist experimenting, researching, and developing his Nen abilty — showing the entire process from idea to execution