My impressions of the novel
I've read 14 volumes of Gimai Seikatsu. It's possibly one of my best reads of recent years, and overall it's been an amazing experience. Ghost Mikawa writes this story with great care and detail; you can tell he loves these characters.
And I also really appreciate how honest he is in each volume (Author's afterword), where he says he didn't want to write a toxic drama or one with fetishes. He opted for a healthy drama and romance, where two strange 16-year-olds happen to be step-siblings.
Watching Yuuta and Saki's relationship evolve, step by step, sometimes with stumbles and insecurities, but always focused on resolving things, is wonderful. The novel is greatly enhanced when we switch from Saki's diary to her point of view.
The secondary characters like Shiori, Maaya, and Maru also make a great contribution to the story, and their support for the protagonists is very well developed. Yuuta and Saki's romance stands out for its everyday moments. It doesn't aim to be an epic romance, but rather something simple and meaningful.
From what I've read from the author, the novel will end with a little over 20 volumes; he wants to see Yuuta and Saki get married. A great writer.