Lyra has been murdered, and as detectives usually do, they suspect the spouse first. Bon Bon attempts to convince the detectives that she didn't do the crime, but this requires her to recall all their precious memories together.
WARNING: This has implied sex. Implied. No real sex. There's also minor violence and some offensive language, hence the Teen rating.
The reason this is Dark and Comedy is because while this is a dark story, the dialogue is, at times, humorous.