I really wanted to love this manga, and when reading the summary of it and the first few chapters I really did. In fact, that initial enjoyment made me give this a 9 for the longest time and is also the biggest reason for why I’m now writing a review. However, ‘I’ve Been Killing Slimes for 300 Years and Maxes Out my Level’ changed as the manga went on and went from more of a relaxing, slow paced story about a girl, after dying from overworking, who wants a redo of life and to enjoy it and her struggles to maintain that quiet, peaceful life, to a yuri-styled family theme of her protecting her ‘family’. Perhaps it’s only my fault for expecting that initial theme to go on, and I understand how it can be difficult and perhaps boring to write a story based solely on that, but those chapters where it did cooperate those themes of slowing down in life, of a second, better chance in life and to enjoy it to the fullest really were very enjoyable to me. The new theme that the manga now closely follows, of a solely female household where they’re all ‘family’ and it’s strictly based on the relationship between them, although it sounds nice and isn’t such a bad plot to follow, wasn’t terribly implemented well and really leaves a bad taste to my mouth. I wish that they simply stuck with this theme and build off of it, making a feel-good type of slice-of-life isaeki manga,

However, do not let that fool you to believe that this manga is all bad. ‘I’ve Been Killing Slimes for 300 Years and Maxes Out my Level’ is enjoyable throughout to read, even after the transition in theme, and I’m sure that if you enjoy family-oriented stories you will enjoy it much more than I did. Perhaps to some of you this change in theme is actually when the story got much better and more enjoyable and becomes a 9 or a 10 to you. For someone like me, who rates anime and manga bashing on a 5 being average, a 7 being very enjoyable, and a 10 for a masterpiece that I will remember forever, a 6 is not a poor score at all. I simply wish that they stuck with the initial theme and built from there. The manga simply just doesn’t stuck with what I believed it did incredibly well and instead followed a path it delivered more mediocrely on, which is the reason for my 6.

TLDR: The beginning of ‘I’ve Been Killing Slimes for 300 Years and Maxes Out my Level’ was based on the rebuilding of a life of a girl and her enjoying life to the fullest, and I really, really enjoyed this theme. However, the theme changed as the manga went on, and got progressively worse for me. Netherless this manga is still an enjoyable read, especially if you enjoy family-oriented themes.

*For clarification, I have never read the light novel version of ‘I’ve Been Killing Slimes for 300 Years and Maxes Out My Level’; this review is strictly based on the manga*