As Mikado confronts Sensei, his birth father, he learns that Sensei is a killer and hates Mikado himself enough to want to kill him. Despair threatens to make Mikado's powers run wild.
To keep Mikado from going berserk, Erika borrows Hanzawa's power and creates a path to the space that holds Mikado and Sensei.
At the same time, in order to save Hiyakawa, Mukae continues to speak with the young Hiyakawa who has fled into a space Sensei has created.
Like a nuclear reactor... 
and the reactor core is right here.
مثل المفاعل النووي... وجوهر المفاعل هنا
Wie ein Atomkraftwerk.
Es como un reactor nuclear
y esta es la caldera.
Es como un reactor nuclear
y esta es la caldera.
Une sorte de réacteur nucléaire.
Le cœur se trouve ici…
Una cosa simile a un reattore nucleare.
Como um reator nuclear,
Это что-то вроде атомного реактора.
А его котёл…