[ENGLISH-SUBTITLE] ATID-435 Stepsister Training, Our New Stepdad Teases Us Every Night… Kanna Shirashi, Rei Kuruki. Our sisters grew up in a single-mother family. My mother, who had been hospitalized and discharged due to illness, remarried. The new dad is a wealthy man and our lives have changed. My father sent my mother to a large hospital and devoted herself to treating her illness. My mother will soon be discharged and the whole family will be able to lead a happy life … I thought so, but my father … was different.