The Most Affectionate Thing in the World

When Obito and Black Zetsu came to Peerless Tang Sect. "I will go back, I will change everything!" Obito wants to save everything and change everything for the "god" to return to the ninja world. And Black Zetsu also wants to go back and rescue Kaguya. The two can only help each other and struggle together in the unfamiliar Douluo Continent. Can two souls from another world return to the ninja world...