In the battle at the Valley of the End, Senju Hashirama was victorious. Uchiha Madara's whereabouts are unknown.
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Uchiha Madara was silent in front of the [system] that was mumbling in his conscious space and decided to throw him to other worlds.
[System]: Don't worry, these experiences are in a world without you. You can make great efforts in the parallel world, prepare for your ideals, and accumulate some experience!
Uchiha Madara was shaken.
[System]: And, as far as I know, there are several worlds where Uchiha Izuna is still the clan leader, and Senju Hashirama is helping his younger brother fight Uchiha...
Uchiha Madara: Go now!
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Finally, the system that filled the world (Hashirama's) favorability ran away with peace of mind, and told Uchiha that Senju Hashirama, whom Madara and he had established a relationship with, seemed to be from his own world.
Uchiha Madara:? !
Intention: If.