I like the concept, and ( ͡° ͜ʖ ͡°) the how close he is with his family lol. Tbh the background story of how he met all his wives etc sounded more interesting than the current story since so much has happened prior, it takes a while to catch up to all the characters’ backstories and pasts. I would totally read that “prequel” if author will write one. Anyways, would be far more interesting to explore something beyond zombie invasion apocalypse plot. Also, much of the writing is written like a summary of things happened and I think it would be far better to write with more detail to “show” the reader what is happening rather than summarizing after the fact. There’s also too many characters introduced far too quickly. I think you should pace this better.
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LIKEThanks for the review! About the background story, I intentionally write it to be more interesting, because even I have become bored when I started this story. The MC was supposed to be smart, calculative, cunning, have everything go according to his plan and so on. But I'm not confident and smart enough to write a character like that and I think that kind of protagonist is not suitable in the long run for my story, so I instead decided to make an MC sheltered away from the cruel world by his ever so dependable(somewhat yandere) wives, daughters, oneesans who would make the world(or the whole existence since this is multiverse) know how great their adorable Rei is. And it's unlikely that I will write a prequel, but I'm planning to write short stories about Rei's early adventure in Is-kai. I will also write some short stories dedicated for each of his wives and important characters so that readers won't easily forget about them.