Here's a little synopsis analysis to start.
Your synopsis has two parts.
*Three years ago, Kato Himari was forced to end her first love in order to cherish herself more. On the same night, she met him in a series of strange events.
Life went on and the uncanny events were put at the back of her mind.
After nursing her heartbreak for three years, a funny companionship of a cat and a little dumpling led her to meet a warm and tender man.
Three years ago, Hayashi Kazuya was compelled to assume a crucial role after tragic events kept on befalling his loved ones. In the process, he had to redefine what was important to him.
There were things he had to let go of.
There were things he had to hold on to.
As he was still hanging on a thread, he met her who reminded him of smiling daffodils to the sun.
Would their encounter give them second chances of gaining more hopes in the face of the future?*
And THIS ONE:
The orange tabby cat sneaked out of the house, bringing back with it a little girl to resurrect the faint link between two people who had just crossed paths together once.*
*"Uncle, when would you give me an auntie?"
"Uncle, why don't you marry Teacher Kato home?"
"Teacher Kato, do you find my uncle handsome?"
Both of them exchanged glances before they hurriedly looked away with the tips of their ears reddened. The little girl grinned and gave thumbs up to the orange tabby cat next to her before she looked at her back.
"Big Brother, look! I've found us an auntie!"
The orange tabby cat happily agreed to the little girl's words.*
It isn't necessarily a bad thing. However, the way it is structured is confusing. I found myself frowning when reading it. I had to read back the first sentence a couple of times before understanding that part one talked about the characters backgrounds and part two is some kind of short story that announces the tone/color of your book.
In my opinion, either you keep one part or you fuse both, or find a way to make it flow. Keep in mind that a synopsis on Webnovel (the right word is actually "blurb"), needs to:
- Introduce your main character(s)
- Announce the tone and genre (don't write "this is a romance/slice of life book!" please)
- Be short, NOT TOO short mind you.
- Explain the main-conflict
You already got those tho. So kudos to you. Just make it flow better.
The "three years ago" part of the synopsis wasn't right to me, because it's repeated twice. It feels like we're going backward, but we're actually reading forward. Weird....
The cat seems important and cute. But... I kept wondering what that thing was doing here. And who were those people talking? We can guess who they are, but with no actual settings to relate to it's kinda hard on the reading part. However, it's cute.
So to put it in a nutshell, your synopsis already has the main elements for a good one. But you need to correct the flows, meaning, improving the readability and avoid confusion.
If I wasn't clear enough, because I wasn't, do ask me to clarify the points you didn't understand.
Hope it helps.