Until 31 May 1931 , Colonel Seishiro Itagaki , Lieutenant Colonel Kanji Ishiwara , Colonel Kenji Doihara , and Major Takayoshi Tanaka had completed plans for the incident .
Until 31 May 1931 , Colonel Kenji Doihara , lieutenant colonel Kanji Ishiwara , Colonel Takayoshi Tanaka , and Major Seishiro had completed Itagaki plans for the incident .