 Natsuko was prone to violence and morbid outbursts, which are occasionally alluded to in Mishima's works.It is to Natsuko that some biographers have traced Mishima's fascination with death.Natsuko did not allow Mishima to venture into the sunlight, to engage in any kind of sport or to play with other boys; he spent much of his time alone or with female cousins and their dolls.