When Shizu was still with Demon Lord Leon, it was a Hero who rescued her. That Hero was Shizu's inspiration to help as many people as she could for many years. She even worked as a teacher for children who'd come from other worlds. And now, as her time comes to an end, Shizu asks Rimuru for one last favor...
Before I can slug the Demon Lord 
Leon Cromwell who made Shizu-san cry,
أنني قبل أن ألكُم سيّد الشياطين ليون
،كرومويل الذي أبكى شيزو-سان
Um dem Dämonenkönig Leon Cromwell
ordentlich die Visage einzuhämmern,
Antes de darle una buena al Rey Demonio
Leon Cromwell que la hizo llorar,
Antes de darle una buena al Rey Demonio
Leon Cromwell que la hizo llorar,
Je dois retrouver la trace du roi-démon
Leon Cromwell qui a fait souffrir Shizu
Ma, prima di poter prendere a pugni in faccia il Re
demone Leon Cromwell, colui che l'ha fatta piangere,
Antes que eu possa dar um soco na cara do
Lorde Demônio Leon Cromwell, que a fez chorar,
И для того, чтобы хорошенько врезать
Князю Тьмы Кромвелю, что мучил её,