Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... 

Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.
Only one absolute being can be
the true protagonist of this world.
لا يحقُّ لأحد أن يكون البطل الحقيقيّ لهذا
العالم سوى كائن مُطلَق واحد
In der Welt kann nur ein absoluter
Herrscher die Hauptrolle spielen.
Solo alguien perfecto
puede ser el protagonista del mundo.
Solo alguien perfecto
puede ser el protagonista del mundo.
Seul un être absolu est capable
Questo mondo può avere un solo protagonista,
un'unica creatura suprema.
Só um ser absoluto pode ser o 
verdadeiro protagonista desse mundo.
властителем мира может стать