Seicho

Seicho (青鳥, blue bird) is a type of bird which is used to deliver a letter between the officials in court and to other kingdoms. They are not Youma.

The birds are notable for their ability to repeat the words dictated to them in the exact voice of the person sending the message. They only eat silver grains, thus usually only nobility can afford to keep them.

To communicate with Rakushun while he is studying at the Daigaku in En, Youko Nakajima gives him a seicho and Enki supplies Rakushun with the silver grains the bird needs to eat.