"Teacher Minato, you possess Space-Time Ninjutsu yourself. Given your understanding of Space-Time, you should know just how troublesome this Akatsuki member who is about to invade will be. So please, please do not spare Teacher Kushina's body. Even if something goes wrong with Teacher Kushina at that time, even if her condition worsens, please stabilize the seal at the very first moment and make the Nine-Tails submit completely! As long as the seal is stabilized again, with Teacher Kushina's strength, no matter how powerful that Akatsuki ninja is, he won't be able to stir up any trouble!"
Watching his wife Kushina nod gently, her face filled with a blissful smile, Minato Namikaze, one hand pressed against the seal, took a slight breath. In his mind surfaced those words Chiba had spoken to him that day, along with the gravity and solemnity that had never before appeared on the child's face.
"Kushina, thank you."
At that thought, those low, gentle words slipped from his lips without his realizing it.
"Minato..."
Hearing those words and seeing her husband shift his gaze away, his expression slowly growing solemn and serious, Kushina's eyes curved into crescents, and the happy smile at the corners of her lips seemed to grow even brighter.
I'm sorry, Kushina!
Even though you've just given birth and are exhausted, please endure a little longer.
I have to make the Nine-Tails submit completely!
As the Chakra in his hand flowed out, transforming into an unceasing stream of Sealing Jutsu Formulas that merged into the Jinchuriki seal on Kushina's abdomen, this apologetic yet incomparably resolute thought flashed through Minato Namikaze's mind.
Now that he knew someone would come to attack, and that it was a Space-Time Ninja—the most troublesome kind—even without Chiba's repeated reminders, he understood the importance of the seal.