As predicted, the only way this "works" is if "solo" is redefined as monogamous marriage.
For this to be a happy end manga story, it ends up just becoming a romance story between a self-sufficient guy who's rough around the edges and prefers solitude and a happy-go-lucky woman who has no qualms about threatening high-level crimnal offense charges towards strangers to get her way.
But she's sexy and cooks delicious meals, so everything's forgiven, haha LOL!
Gen escapes to the parks to camp so that he doesn't have to interact with anyone. He likes zero interaction with people as his ideal vacation. The girl is the opposite and needs social interaction to feel happy and be herself. The only way this works is when these two become a romantic couple, achieved in one way: Gen compromises.
Easy, because she's got big boobs and made him breakfast, haha INTERCOURSE!