The Prelude

Aizen, in his relentless pursuit, accelerated his own time, delving into a project that remained an exclusive secret. The Hōgyoku, a culmination of decades of meticulous work, was accessible only to him. Its existence was safeguarded by unparalleled security measures, surpassing even the inviolability of the moon itself.

Located within the moon, the Hōgyoku's sanctuary was an impenetrable fortress, guarded by weapons comparable to special-grade cursed tools. Invading this facility proved more challenging than eradicating all living sorcerers combined. A smokescreen of formidable defenses concealed the true nature of the Hōgyoku.

To bridge the celestial gap between Earth and the moon, Aizen devised an advanced curtain technique. This intricate process involved establishing strict rules: the curtain could only function for him, any other person's attempt would be futile, sunlight exposure would render it ineffective, and a counterpart curtain on the same day must exist at the destination. By applying complex jujutsu techniques to the curtain, Aizen successfully crafted a teleportation curtain, granting him exclusive access to the moon's hidden realm.

As Aizen delved deeper into his research, he uncovered the necessity of acquiring special-grade tools, bodies of special-grade curses, and special-grade humans to impart the Hōgyoku with the unique aspects required for its evolution. Numerous cursed spirits were absorbed, but the challenge lay in obtaining special-grade spirits and ensuring their vitality during absorption.

To fulfill this intricate process, Aizen set his sights on formidable entities. He sought to acquire Geto's cursed technique once he reached special-grade status, essential for the absorption of spirits. Sukuna's fingers, at least five in number, along with a spirit possessing extraordinary cursed energy like Rika, became vital components.

For the evolution aspect, samples from the strongest individuals were imperative—Gojo, Geto, Yuki, Megumi, and the reincarnated sorcerer from the past. The Star Plasma Vessel was deemed crucial with its connection to the Six Eyes and Destiny.

However, the most formidable challenge was absorbing Mahoraga alive and intact. This required the involvement of Megumi, the key to completing the Hōgyoku. The intricate plan was set into motion, awaiting the pivotal moment when Toji would face Gojo Satoru.