whys the translation so british

It was simply in maybe the second translation I did that I realized that Japanese maps better to British English than any form of new world English because it has more registers and dialects so I decided to use that. Like Japanese it can range from working class to extremely posh and formal, unlike new world English.
The sexual assault is just fan-service. I suppose it has some plot reasons since the plot wouldn't really work without Hana disliking Kengo.