I want to begin by saying I desperately wanted to love this book and I'm kinda pissed off it didn't deliver in any way.
Random Thoughts:
The characters are husks.
Everything is told to us and nothing is described.
There is no chemistry between the FMC, Isla, and MMC, Kei.
Yes, Isla is not like other girls.
No, Isla does not reckon with the ethics, purpose, risks, or opportunities of her isekaiing herself back in time by typhoon-kun.
No, Isla doesn't actually do anything the entire book. In fact, I'm confident she doesn't even have a thought through the whole nine months she's in Meiji era Japan.
No, she doesn't have women friends because they all hate her or are jealous of her for REASONS 😡.
I didn't need to hear about women staring at her breasts at the hot springs because they're So LaRgE.
There is not really a story. It all meanders. Nor is there actually a romance because Isla and Kei share literally nothing in common and have almost no meaningful conversations.
No, you are not "impulsive, passionate Isla" because you have no personality and never once showed you were either of those things.
Some more in-depth thoughts:
As an isekai enjoyer, I'll admit the book called to me. Bad, good, ridiculous, I can often get down with an isekai. In fact, I was excited this was transferring to books out my way in the US (I know time travel romance stories exist, but I would classify this as isekai and suspect Poppy Kuroki would do the same). But what tends to make isekai so fascinating to me is missing in this story: the push and pull of modernity vs. history, the changes in language, culture, customs, beliefs, medicine, education, views of women/their role in the world, and how characters reckon with a world they know nothing of or only know through stories and history. This book is bereft of all of it. The spark that makes isekai fascinating was never lit. The rich culture and fascinating political shifts of the era is used like an elementary schooler painted backdrop for their after school play. It was ALL THERE FOR HER and she didn't grab it or develop it in any way. Every time the book touched on something potentially fascinating, it just moved on. If I were isekaied into the past, I would desperately be trying to figure out what I could remember about that era. What if she gets hurt and needs medical care? How will she get food? Does she need to work? Does she need to marry? How can she get home? Nah, none of those questions are ever really contemplated. Isla is the most Type-B person who ever B'd.
Authors need to remember that we do not love their characters, world, and story as they do, nor do we know it as they do. We have to be convinced and brought along as we're compelled to see what the author sees in their world. That work is not done here. I care for none of the characters or their plight. Actually, I hate most of the characters, especially Isla who has no real moral compass and yet still disappoints me often. Of course this is a self-insert, but I can even get on board with that as long as everything else isn't lackluster. The main has no personality, not just because she's a self-insert, but because she takes almost no real action in the story that could show us who she is. Nor does she have any thoughts that could show us who she is and how she uniquely views the world. She even went to Japan looking for info on her great-great-great grandfather and barely does that when she's in the past!! She asks Kei one time and does nothing else to hunt for this man. He just shows up one day. Her WHOLE PURPOSE was just given up on immediately and so there was no feasible way to connect with this character.
TW: SA
Kei's sister lying about rape that leads to the death of the man she was seeing and their own father was appalling to read. I couldn't believe a woman was writing it. Irresponsible, tone-deaf, and reductive. I almost DNF'd the book because my jaw was on the floor. When Kei confronts his sister about it, she admits she was sleeping with a man and she got pregnant, then chose to lie about him raping her. Then ten sentences later, Kei is inside Isla. Again, my jaw was on the floor. How anyone could think of sex moments after such a horrifying conversation, I will never understand. It's giving "her moans drowned out the sounds of the injured and dying" but so much worse.
The prose read like middle grade. It's stilted, basic, uninteresting, non-descriptive, and unvaried. There is no flow. I consistently forgot everyone in the story was an adult because of how they spoke. And they all spoke exactly the same so I stopped bothering to notice who was speaking. None of the characters had interest or thoughts or hobbies. It felt like they were nothing but a samurai or a woman. There are no other traits a person can have, apparently.
Isla should have never "gone to war." It was pointless, she did nothing, she was incapable of doing anything. I can get down with an unskilled person trying to fight or making themselves useful somehow, but she just kinda sat around and ran sometimes while everyone died around her. What was the point of the swordplay lessons if she never picked up a sword?
There is no real magic system, but the little magic we have is never explained. I've never seen an isekai that didn't at least have some explanation for how the MC got knocked into another world/time. That's just a basic writing requirement. How did these temples move her through time??? Can she do this for other times/locations? Is it the temple itself? WHO KNOWS? Certainly not Isla or the author. Isla didn't even care herself how it happened!! Isla is pathetically and hilariously incurious, which makes for an abysmal lead.
I'm just gonna stop here because I feel like I could keep going and I don't think any of us want that.
The last thing I'll say is that if you want a fun historical isekai from this era-ish watch or play Hakuouki or Meiji Tokyo Renka.