Aizawa Azusa, a corporate drone who died of exhaustion from overwork in her previous life, is reincarnated in another world, where she decides to live out a slow and uneventful life forever. But then, 300 years later, she discovers that the experience she earned by defeating slimes every day just to keep up her easy lifestyle has brought her to level 99 and made her the strongest in the world. The rumors begin to spread, and soon trouble comes knocking...
I swear I'll never tell anyone that 
you're the strongest there is!
أقسم أنّني لن أخبر أيّ أحد
!أنّك الأقوى على الإطلاق
Hiermit schwöre ich Ihnen, keiner Seele davon
zu erzählen, dass Sie die Stärkste von allen sind!
Juro que no le diré a nadie
que es la más fuerte del mundo.
Juro que no le diré a nadie
que es la más fuerte del mundo.
Giuro che non dirò mai a nessuno 
che siete la più forte che ci sia!
Eu juro que não falarei pra ninguém
que você é a mais forte do mundo!
Клянусь, никому не расскажу,
что вы самая сильная!