"Hm, by the usual practices of the Japanese police, this should have been ruled an accident," he mused. "The scene did indeed look very much like 'human spontaneous combustion,' but the authorities promptly dismissed it as an accident. They must've suspected from the outset that Lady Nakaki could have been murdered, and feared the case might run deep – the kind of thing that's troublesome whether you want to talk about it or not."
Kiyomi Liuli thought so too, guessing that Lady Nakaki needed to fake her own death for some reason. But when a person disappears without a trace, the people involved might grow suspicious and investigate. They might even hire a bunch of famous detectives to scrutinize the matter, leading to this event: stealing a corpse to stand in as the dead, but leaving the underlying motives and whether there were any accomplices a tantalizing mystery.