Uchiha: Starting as the Jinchuriki of Tobirama

In Konoha, Uchiha Aomi has the Confrontation King System. Whenever he stirs somebody's emotion, the system would identify the one as his confrontation target and extract different skills from the target. The first target is Senju Tobirama. [From your target, Senju Tobirama, you have acquired Water Attribute Chakra Mastery (Senju Tobirama version)!]