What are the bamboo"?

They are from China.

They look just like us.

They live by night.

They drink human lifeblood but otherwise keep their distance.

And every century, they grow white blooming flowers.

A boy name Kyo is saved from the precipice of death by Bamboo, a vampire born of the tall grasses. They start an enjoyable yet strange shared life together, Kyo and the gentle Bamboo. But for Bamboo, communication with a human being is the greatest sin."