People changed.
When Uchiha Yue had first transmigrated here, all he had wanted was to grow stronger and protect his family.
Yet Uchiha Yue's strength had become the very source of disaster. If he had not grown so powerful, perhaps Uchiha Madara would never have set his sights on him and tried to make him his spokesperson. By the same logic, if Uchiha Yue had not been so strong, his parents, Uchiha Izuna and Uzumaki Minako, might not have had to face so many schemes. After all, they had lived peacefully in Konoha for so many years, hadn't they?
In the end, Uchiha Yue had become the Dark Asura, wanting to turn the Shinobi World into hell.
Had Kushina Uzumaki not risked her life to stop him, forcing Uchiha Yue into a clash with the Death God, the Shinobi World might have already vanished. Uchiha Yue, that world-destroying Asura, would have destroyed the entire Shinobi World and turned it into a scene from hell.
And what about Kushina Uzumaki?
She had transmigrated without any explanation, suddenly returning to the era when she had been born. Kushina Uzumaki's first feeling had been terror, but under her parents' care, she gradually forgot the pain of transmigrating.
The most important people in one's life would always be one's parents.
A lover might betray you, and a child might become unfilial if not raised properly. Other than one's parents, there was no one else who could give selflessly.
Bathed in her parents' care, Kushina Uzumaki gradually forgot the terrifying incident of her transmigration and immersed herself in an ocean of paternal and maternal love.
And in that ocean of love, four years swiftly passed.
For those full four years, Kushina Uzumaki had scarcely thought about training. What she thought about most was how to