At 8:15am August 6, 1945, I was in a temporary torpedo engine assembling plant constructed at the torpedo experiment factory of Kure Naval Arsnel. A lightening blitz ran through the plant. The mobilized students from Hiroshima Prefectural Kure No.1 Girl School who dedicated themselves to the assembling works without wiping sweat from their foreheads were struck dumb with surprise. At next instance a blast of explosion came with fierce sound and the plant building vibrated with rattling noises. Fortunately no damage to people there because no glass window was broken. Then people outside the plant made noise. When I got out from the plant, I saw growing mushroom clouds beyond the north hill. At first the clouds were dark gray and then changed to beautiful pink gradually. A veteran foreman said it must be the explosion of Yoshiura Gunpowder Warehouse located in north of Kure Naval Base. Everybody there agreed with him. The plant restarted the operation as though nothing has happened.
As an air-raid warning (I do not remember whether it was a pare-warning or a real warning) was called off a few minutes after eight o'clock, we went out to the ground for breathing fresh air looking up fine blue sky. Then two B-29 bombers were coming toward Hiroshima in a bit west of us. A bomber went a little ahead and another one flied a bid east but parallel to the foregoing one. I wondered a little why the enemy planes were flying over us although the warning was called off. At the very moment when we returned to the plant and started the operation, the blitz and blasts came to us. I think the foregoing bomber must be the one which dropped an atomic comb. Although I did not see the explosion itself, I saw the circumstances just before and just after the bombing. I am one of few eye witnesses who experienced the bomb explosion.
Trucks of Navy carried back many wounded from Hiroshima at about two thirty in the afternoon. The rumors that the whole city of Hiroshima was burnt to grounds by a single bomb explosion with countless deaths and wounded were spread through the arsnel within a few minutes.