Personal taste. Basically, they are all stories about female protagonists, and the main theme is not to abuse the female protagonist. Pay attention to smooth writing and shaping of character image and plot. It's even better if it's funny and imaginative.
The plot arrangement is good, the characters are well created, and there is some imagination about the heroine's personality. . . But only in this way can the Shura field be reasonably arranged. The ending also stops at just the right place. The only pain point is that there are many typos, which affects reading.
Apart from the story of the fourth sister, this is my favorite book in the series. It would be better if the love line could be transitioned more carefully. I like the protagonist's character and the overall plot rhythm and imagination.