Yuuki is saddened by the death of Clayman, and Luminus is saddened by the death of Roy. Steeped in sadness, and having lost their friends, they seek their next move against Rimuru, who has grown in power and become a true Demon Lord.
Which is precisely why 
I must protect Lady Luminus.
لهذا السّبب بالتّحديد يجب عليّ
حماية لومينوس-ساما
Genau deshalb muss ich
Meisterin Luminas beschützen.
Ed è esattamente per questo
É precisamente por isso que
devo proteger a Luminous-sama.
И именно поэтому…
я должна защищать госпожу Люминас.