Deep within the Demon Slayer Corps Headquarters stood a dojo cut off from the outside world.
This was the forbidden ground where the Ubuyashiki Clan meditated. For hundreds of years, no outsider had ever set foot here-only successive Oyakata-sama.
Today, however, it opened its doors to Uesugi Sasuke alone.
Sasuke sat cross-legged in the center of the dojo, his breathing steady, his mind as still as water.
His battle with Kokushibo had left him gravely injured, but it had also deepened his understanding of this world's system of power.
Now, at last, he had time to examine his greatest secret-the system.
He closed his eyes and sank his awareness into his mind. The familiar glowing screen appeared in response.
A stream of messages scrolled past like a waterfall.
[Ding! Successfully defeated Upper Rank Two, Doma. Evaluation: perfect.] [Ding! The host has attained the epic achievement "Nemesis beneath the moon" (fought Upper Rank One to a draw). Evaluation: legendary.] [Calculating rewards...] [Points +1,000,000.] [Special exchange option unlocked: introduction to senjutsu chakra (incomplete). Required points: 800,000.] [As the host has fought this world's foremost swordsman and grasped the essence of his 'Breathing Style,' your Sharingan's ability to analyze motion and energy flow has permanently improved.]
Sasuke's gaze lingered on "senjutsu chakra" for a moment.
This was a formidable power second only to Six Paths Power. If he could master it, his strength would surely make another leap.
But he did not exchange his points for it immediately.
Because he knew there was something more important.
He continued reading.
A scarlet notification bearing a warning filled the entire screen.
``` [Warning: the Eternal Mangekyō Sharingan has reached the upper limit of power permitted by this world's rules. Energy overflowing...]
[Detected the host's resolve to achieve "Severing Karma." Detected that the host