Rubuta ci gaba don wannan sakin layi - Baya ga Associationungiyar Greater Asia, Matsui ya kuma yi aiki a duk lokacin yakin a matsayin Shugaban Associationungiyar Tsarin Tsaro na Kasa, ƙungiyar da ke adawa da Yammacin Turai da kuma anti-Semitic da aka kafa a watan Fabrairun 1942 don tallafawa ƙoƙarin yaƙin Japan. A shekara ta 1945 lokacin da Allies suka ci gaba da kai wa Philippines hari, Matsui ya sanar a rediyo cewa Japan ba za ta taɓa janyewa daga Philippines ba "ko da Tokyo za ta zama toka". Ba da daɗewa ba bayan haka ya kuma bayyana shirye-shiryensa na yin magana a taron lacca a ranar 20 ga Agusta yana adawa da duk wani mika wuya. Duk da haka, a ranar 15 ga Agusta, 1945, a gidansa a Atami Matsui ya ji Sarkin sarakuna Hirohito ya sanar cewa Japan ta miƙa wuya
ba tare da wani sharadi ba ga Allies.