"Domain? You mean the domain in 'Domain Expansion'?"
Although Darkrai's "dream invasion" had already been surprising enough, Akesato was still taken aback by Satoru Gojo's words.
"That's right. Didn't you notice?"
Satoru Gojo was somewhat surprised as well. He had thought Akesato, who was already standing at the threshold of Special Grade, would have noticed.
"I'd only heard of domains, never actually seen one. Come to think of it, given Cursed Spirit Rika's level, it would be stranger if she didn't have a domain. It makes sense for it to manifest in this form."
As far as he knew, Satoru Gojo was the only jujutsu sorcerer who had clearly mastered a domain. There were a few among Cursed Spirits, but none of them had appeared at this point.
"Right. None of you should have seen one before."
Hearing Akesato's words, Satoru Gojo clapped his hands in realization.
"Perfect. An opportunity like this is rare, so Teacher Gojo will give you a lesson for the first time in a while—the pinnacle of jujutsu combat, 'Domain Expansion.'"
This was standard practice at Jujutsu High: using powerful enemies as teaching aids and giving lessons on the spot, truly putting the principle of combining knowledge and action into practice.
It was rare for their teacher to be this self-aware, and what he was teaching was priceless knowledge that might well be unique among jujutsu sorcerers. The students gave up the urge to mock him and listened seriously.
"Simply put, 'Domain Expansion' means using cursed energy to construct an 'Innate Domain' imbued with a Cursed Technique around yourself."
"Teacher." Yuta Okkotsu raised his hand, exactly as he would in class.
"Hi~ Yuta." Satoru Gojo remained thoroughly in teacher mode.
"What is an 'Innate Domain'?"
"So I need to start there."
Only then did Satoru Gojo