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 just made a habit of beating up the 
local slimes, and this is what happened!
كلّ ما فعلته هو هزيمة الهُلاميّات هنا 
!بشكل دوريّ، وكانت هذه النّتيجة
Das hat sich nur aus meiner Gewohnheit ergeben,
Jagd auf die Schleime in der Gegend zu machen.
Es el resultado de derrotar
a slimes pacientemente.
Es el resultado de derrotar
a slimes con paciencia.
je n’ai fait que tuer des slimes
pendant des centaines d’années !
Avevo solo l'abitudine di sconfiggere gli slime 
qui in zona, ecco com'è successo!
Eu só criei o hábito de derrotar os slimes
da região diariamente, aí deu nisso!
Я просто взяла за привычку каждый
день убивать слизь, вот и всё!