[KBTKaiser]

Spoiler for D.C. III Plot Spoilers:

I think it's more the idea that all the corresponding characters ended up with indescribable reincarnation setups, tweaked to fit the era while still keeping the relations of the characters more or less intact. Thus Shiki being reincarnated as a sharp-tongued older sister. The only person that NO ONE(in game or user-side) can ever figure out is Suginami.