Toshiko's previous life can be said to be a huge tragedy, but she found her happiness in her final marriage after all. After she died of a serious illness without any regrets, Toshiko discovered that she did not come to the underworld to be reincarnated, but inexplicably traveled to a sister-in-law. Mother, the little girl does not have all the advantages she had in her previous life, but she has the warm family she longs for most, and she is still a ninja. The students she met in her previous life are now old enough to be her grandparents, and the feeling of being trained by a kid is really unpleasant, isn't it? But calm down and think about it, maybe this kind of life is what should be truly cherished.