Nighttime, Tsunade's home.
Mokgetsu and Tsunade conducted the final check on the various development materials for the Yang Seal in the study.
With the assistance of Tsunade, the number one medical ninja in the Ninja World, coupled with diligent practice of Fuinjutsu, Mokgetsu was finally nearing the completion of his battery plan.
At this moment, Mokgetsu was just one step away from his envisioned Yang Seal: modifying and perfecting the existing Yang Seal within his body; the specific theory was already very complete.
"I'm exhausted, it's finally over." Tsunade collapsed in the chair without any image.
"But it's worth it, isn't it? Not only is my Yang Seal perfected, but you've also completed the development of the Strength of a Hundred Seal." Mokgetsu chuckled, taking a sip of tea.
Tsunade helped Mokgetsu perfect the Yang Seal, and Mokgetsu also assisted Tsunade in developing ninjutsu complementary to her Yin Seal.
Without the Strength of a Hundred Seal, the Yin Seal is hardly useful.
Tsunade rolled her eyes, saying irritably, "You're talking like mutual development and mutual benefit; I'm not that eager to perfect the Yin Seal."
Tsunade studied the Yin Seal and the Strength of a Hundred Seal purely to kill time out of boredom, rather than like Mokgetsu who wanted to enhance combat power.
Because Tsunade wasn't planning to go to the battlefield, nor did she want to fight as a ninja as she did before; she didn't have the need to improve her strength.
If the Strength of a Hundred Seal didn't have some other uses, Tsunade wouldn't even bother researching it.
"You have to prepare a lavish midnight snack this time, at least ten times the usual dinner!" Tsunade seriously reminded.
In a certain sense, this might be a farewell meal; Tsunade had to have a hearty meal.
Not that Tsunade was preparing to leave Konoha, as Konoha was still amidst the whirlpool of war, and Tsunade couldn't leave.
She felt that her interactions with Mokgetsu would decrease in the future, at least he probably wouldn't come over to help with cooking at her house again.
Because the reason Mokgetsu knew Tsunade was from wanting to learn knowledge from her for developing the Yang Seal.
Their relationship improved later, plus Mokgetsu offered some benefits, so Tsunade helped in the development.
Now that the ninjutsu development was complete, Mokgetsu no longer needed her that much.
Without anything to ask of her, Tsunade wasn't confident enough to make Mokgetsu obediently come to her house to cook.
After all, she's one of the Sannin, and Mokgetsu is also notably Blazing Sun Mokgetsu, not an ordinary ninja.
"Alright, let me finish the last step and prepare the midnight snack; it will absolutely satisfy you." Mokgetsu nodded.
Developing the Yang Seal was no easy task; if it wasn't for Tsunade's help, he might have taken years to succeed.
So saying it's just a lavish midnight snack is underrating it; even if Tsunade wanted an entire luxurious banquet, Mokgetsu would fulfill her desire.
The Yang Seal is immensely important to him, even more so than a perfect-level skill.
"You said it, don't blame me for asking more if it's not satisfying." Tsunade's eyes brightened.
"Yes, I said it."
"Then quickly proceed with the final step," Tsunade urged.
She couldn't wait to enjoy a midnight snack from Mokgetsu that would surely satisfy her.
Actually, even without Tsunade's urging, Mokgetsu was preparing to start; this was the ninjutsu he began planning shortly after crossing over, and having finally completed it, Mokgetsu's heart wasn't as calm as it appeared.
Although the Yang Seal couldn't increase his upper limit, it could enhance his endurance, which held great significance for Mokgetsu.
"Hoo." Mokgetsu closed his eyes, adjusting his breath, focusing his breath to the extreme, entering the state of the Transparent World.
The operation he needed next required high precision, otherwise, it could easily cause internal injury, and severely might even damage the Chakra meridian system.
This was why Mokgetsu had to perform beside Tsunade, even if accidents occurred, Tsunade, the number one healer in the Ninja World, could provide treatment.
The Yang Seal before completion was like the Yin Seal without the Strength of a Hundred Seal: not entirely useless, but usually not very likely to be useful.
Of course, that was for ordinary ninjas; it still had quite an effect on Mokgetsu.
Because even before thorough completion, Mokgetsu had a minor breakthrough, able to affect Shadow Clones, then continually releasing small amounts of Chakra to maintain Shadow Clones, solving the issue of Shadow Clone's duration, making Mokgetsu's multitasking simpler.
The essence of perfecting the Yang Seal was similar to the Yin Seal's Strength of a Hundred Seal.
Only the actual effects differed, Yin Seal automatically heals and enhances strength, while Yang Seal was bound to Mokgetsu's Breathing Chakra Mode.
As long as the Yang Seal in his body underwent version upgrades, Mokgetsu would effectively have an extra Chakra pool, but this pool could only be used for a specific Breathing Chakra Mode.
"Breath of Flame, currently my strongest is still Fire Release," Mokgetsu chose Breath of Flame.
There are considerable differences between various breathing techniques, so the current Yang Seal only supports a single Breathing Chakra Mode, not compatible with all Breathing Chakra Modes.
However, this had little effect on Mokgetsu; if he encountered an enemy requiring a switch in breathing technique, he'd simply turn off the Yang Seal.
After all, this wasn't the Eight Gates Death Gate, which must remain open.
Once Mokgetsu completed everything, he began purifying Chakra and injecting it into the Yang Seal.