A shy and very intelligent thirteen-year-old boy from Seika Village in the Koku Province. He came to the Capital to take the Imperial Exams after passing the Provincial Exams at the age of twelve. His money was given to him by all the people in his village, to wish him well. He later lives with the Kou family since he sends most of what he earns to his village.

He has another personality (Yougetsu) which comes out when he comes in contact with sake. Yougetsu unlike Eigetsu is a strong fighter and is very agile.