The sun rises and sets.
In the blink of an eye, a day has passed.
It's now the dead of night.
Beneath Moon Island, inside the volcano, Seimei finishes his final round of training in the "Extreme Body" technique and teleports back to the island's surface.
As he waits for his body to heal naturally, he takes a moment to sense the changes within himself. No surprise there—he's made progress again. And this time, it's not just a small step forward.
It's clear as day: his body-strengthening efficiency has shot up, and the speed of his physical evolution is way faster than before. By how much, exactly? After carefully assessing himself, Seimei concludes it's about an 80% boost. Yeah, nearly double what it used to be.
The reason? His body underwent a qualitative transformation this time, making his training far more effective than before. Seimei can hardly contain his excitement. This means he can boost his "physique" attribute even faster, which is critical to avoid the overwhelming strain that comes with evolving his Sharingan into the Rinnegan.
He hasn't forgotten the sorry states of Uchiha Madara and Nagato after they awakened the Rinnegan. Sure, their situations had unique causes, but there's no denying the Rinnegan's power played a role. Seimei's goal in unlocking the Rinnegan is to grow stronger, not to end up a broken mess. So, no matter what, he's determined to prevent that outcome.
Strengthening his physique is the perfect way to do it. The Rinnegan embodies yin energy—mental and spiritual power—while the body represents yang energy. Drawing from past-life wisdom, Seimei knows that extremes never end well. Balancing yin and yang is the true path forward. That makes boosting his physical strength a must.
But that's a concern for later. Right now, he's more focused on the immediate effects of his body's transformation. Sure, this leap in progress has massively improved his training efficiency, but it comes at a cost: he's burning through way more chakra.
After some quick math, Seimei figures he used 240 million points of chakra on body strengthening in just one day. Before this transformation, that number was only 130 million. That's an extra 110 million points—a whopping 85% increase! It's a huge jump, but it's also the limit of what his body can handle right now.
Of that 110 million, 30 million is offset by his body's improved recovery, leaving a deficit of 80 million points. Add that to the 27.93 million points he was already short each day, and the total chakra deficit climbs to 107.93 million points.
The increased chakra drain can't be fixed by simply adding a hundred more shadow clones to absorb natural energy. After testing, Seimei found he needs 900 shadow clones to gather enough natural energy to sustain Sage Mode and keep up with his "Extreme Body" training. That bumps his chakra consumption for this from 1 million to 1.8 million points daily—an increase of 800,000 points.
So, his total daily chakra deficit is now 108.73 million points (107.93 million + 800,000). Even though he knew this transformation would spike his chakra needs, seeing the final number makes him suck in a sharp breath. If he didn't know that evolving his Sharingan into the Rinnegan in a week would boost his "mental" attribute and speed up his chakra recovery, he'd probably be freaking out right now. Even with over three years of stored backup chakra, this kind of consumption is no joke.
Luckily, it's still manageable.
"Phew…" Seimei lets out a long breath, pushing aside thoughts of chakra costs. Instead, he starts calculating how long it'll take for his body to reach its next transformation at this new evolution speed.
After mulling it over for a while, he can't pin down an exact timeline. One day's worth of data isn't enough to make a precise estimate for the next transformation. So, he decides not to dwell on it.
Yawning, Seimei glances at the 160 shadow clones still practicing the fusion of seven chakra nature transformations in the nearby forest. With a thought, he dispels his Multiple Shadow Clone Technique. Instantly, every clone on and off the island vanishes.
A flood of memories, chakra, and natural energy surges into him. Closing his eyes, Seimei first sorts and stores the chakra and natural energy, then sifts through the memories, absorbing the training experience they contain.
Time ticks by slowly.
About fifteen minutes later, Seimei opens his eyes, a sharp glint flashing in them. After briefly reviewing the gained experience, he heads toward his wooden cabin. By the stream, he washes up quickly, then steps inside to rest.
The next day, training resumes!
For six straight days, he keeps at it.
Soon, it's the final day of this intense training cycle. That evening, as the sun sets, Seimei appears in the clearing at the center of Moon Island. He's just finished another hour of "Extreme Body" training in the volcano and returned to the island.
His skin is bright red from the volcano's intense heat, but in less than a minute, it's fully healed. That's the kind of recovery power he has now. Without using chakra, his body's natural healing is almost on par with Hashirama Senju's, who inherited the "Sage Body." With chakra, though, Seimei's still a bit behind Hashirama's mastery of yang release, so his max recovery speed isn't quite as fast.
Still, regular ninja weapons can't faze him anymore. Thanks to the volcano's harsh air, he's also immune to common poisons. Even some specialized toxins can be quickly metabolized by his enhanced physique. Ordinary ninjas don't stand a chance of harming him now.
Whoops—got a bit sidetracked.
Snapping back to focus, Seimei dispels his Multiple Shadow Clone Technique, recalling all his clones. After fully absorbing their hour's worth of training experience and memories, he assesses his condition and estimates when his body will hit the next transformation threshold.
After six days of intense training, he's got enough data to make a solid guess. His conclusion? It'll take about five and a half months to push his body to the brink of another transformation. That's shorter than the six-plus months it took last time, thanks to the 80% efficiency boost from his physique hitting 40 points. Even with the increased difficulty of the next transformation, he's confident he can pull it off in that time.
That estimate assumes he doesn't spend time on the "Mind Reflection Technique." But once his Sharingan evolves into the Rinnegan, he likely won't need to use that technique to stimulate its growth anymore. So, five and a half months is the final timeline.
Seimei's thrilled about it.
"Phew…" Letting out another long breath, he stops overthinking. He looks up at the sunset, standing quietly as he admires the shimmering sea under the fading light. After a moment, he decides not to waste any more time. With a flicker, he activates Wind Release: Wings of Wind and soars into the sky, heading toward the Land of Fire.
Next up, he'll take a day to rest. Then, it's time to focus on breaking through with his Sharingan.