Akuma no Hana wa Chi no Nioi

The story is about a brother and sister (Sanae) from a poor family. It was discovered that Sanae was a look-alike of Yuka Takamizawa who is the daughter of a rich man. Natsumi decided to murder her so his sister could take her place. Living as the dead girl Sanae is suspected by the victims brother Louis of being an impostor. There is also poisonous flowering plant that was brought back from Africa...