Nii is the spirit that Shiemi controls. It is a greenman spirit capable of producing plants and various vegetation that is a big help to Shiemi which may start from Shiemi's expertise in remedy's and also capable of clocking demons and providing extra time through the use of wood. It is somewhat "Connected" Spiritually and emotionally to Shiemi as when Shiemi passed out, the wood blocking the demon disappeared. It seems to be able to understand Shiemi's way of naming plants