Shun transmigrates to the Naruto world as Uchiha Shun with a system that makes him stronger with each session.

[Ding, Host and Partner: Tsunade engaged in an intimate act. Affection +12%, Chakra Cap +4, Yang Affinity +0.01%.]

[Ding, congratulations Host, you have obtained the Kekkei Genkai: Incomplete Senju Sage Body.]

[Ding, Host and Partner: Mikoto have engaged in an intimate act. Mangekyo Sharingan experience +50, Chakra Cap +3.]

[Ding, Host and Partner: Miroku engage in an intimate act, Natural Energy affinity +0.01%]

[Ding, congratulations Host, you have gained Secret Technique: Elementary Nature Mode!]

[Elementary Nature Mode: Upon activation, enter the state of unity with nature. More attuned to the world, capable of gathering and storing Natural Energy for personal use, greatly enhancing the power of Ninjutsu/Taijutsu/Genjutsu, etc.]

As he gets stronger, he kills Danzo and forces Hiruzen to abdicate, eventually unifying the Ninja World.