Shizue Takahashi is painfully aware that for many people, 15 years is long enough for memories to fade and for a generation to grow up with little knowledge of the trauma she and thousands of others suffered in 1995.
It was in March that year that members of Aum Shinrikyo carried out its infamous nerve gas attack on the Tokyo subway system. Her husband was among the fatalities.
Although Takahashi, 63, accepts that fading memories are a part of life, she is determined that this one nightmare not be forgotten. Having been a public-speaking representative of people victimized in the sarin attack, she went on to interview them to compile their feelings, memories and experiences for an hourlong documentary film.