Japanese name

From where's the Japanese last name? The credits only give the first. Seelentau 愛^議 19:20, October 21, 2012 (UTC)

Because they are "Ryūdōin" brothers. Their father had such last name I guess--Elveonora (talk) 19:25, October 21, 2012 (UTC)

I know, but what about the Kanji? They're not given in the credits. Seelentau 愛^議 19:34, October 21, 2012 (UTC)