“Prison Realm Boundary” is a special-grade cursed object that Kenjaku prepared to seal the strongest jujutsu sorcerer in the current era, Gojou Satoru. Kenjaku uses the body of Getou to successfully seal Gojou.
Q1: Kenjaku has said that Prison Realm Boundary is “the remains of the living barrier Genshin”, did Genshin create it?
A: Genshin sealed numerous curses inside his body using his barrier technique. After he died, (his remains) became a cursed object.
(img point: Prison Realm Boundary holds great capacity in sealing. Genshin must had been a considerably talented person)
Q2: In the history so far, was there anyone trapped inside Prison Realm Boundary?
A: There was. Basically, it only has capacity of one person, it can’t be used again unless the person trapped inside committed suicide, or the gate open and they got out.
(img point: Because Gojou is sealed inside, the Prison Realm Boundary can’t seal anyone else)
Q3: Time doesn’t pass inside Prison Realm Boundary, does the person inside don’t feel hungry? How about going to the toilet?
A: Because time doesn’t flow inside it, they won’t feel the need to eat or defecate. I haven’t had the chance to include it in the main story, but when a jujutsu sorcerer goes to a long mission where eating and defecating might be difficult, they will put a special “insect” inside their stomach.
Q4: What are Gojou doing inside Prison Realm Boundary?
A: Because if he thinks too much he might be going crazy, I think he’ll just be as absent-minded as he can.
Q5: Jougo has said that he wanted to “add Prison Realm Boundary to the collection”, what does Akutami-sensei think about the “collection of things” that it was added to?
A: It’s (collection of) huge one-of-a-kind stuff that can seal anyone as long as the conditions are met (with the backside looking like a freebie).