[1] Sakaguchi Kiichiro was born in January 1902 in Izumi, Osaka Prefecture.

Kiichiro would be held in the Kure Military Police Detention Center before being transferred to Hiroshima Prison.

[5] The Kiichiro Sakaguchi monument was erected in Izumi City, his place of birth.

[6] Amongst those who visited the monument was Japanese Communist Party politician Yoshiki Yamashita.

[7] On December 7, 2013, a rally was held at the Izumi City Community Center on the 80th anniversary of Sakaguchi's death.