 In the manga some of Reishin's hidden past was revealed, that to him his brother Shōka and his niece Shūrei mean everything to him in this world.The books mention that Reishin plays the biwa, as do his brothers.In the 13th novel, Reishin is finally exposed to Shūrei as her uncle from her investigations on Kōyū's behalf; stripped from his position as the Chamberlain of the Department of Civil Administration, Reishin plans to return to Hong province.