Munemitsu wrote and sent a lot of letters to his wife Ryoko, and while he was in the Miyagi prison, he dedicated to Ryoko a Chinese-style poem in which he appealed the yearning of mutually loving husband and wife.
宗光は妻亮子にたくさんの手紙を書き送っており、宮城監獄収監中に相愛の夫婦の慕情を漢詩にして亮子に贈っている。