ML travelled back into the past in his older body
FL travelled back in time to before she was born
FL is older that she should be because she traveled back in time as a baby
FL travels to the future in the modern world
FL travels to the past to the Sengoku era
ML sometimes travels back in time through dreams
FL travelled back in time to before she was born
ML travels to the past to the Sengoku era
FL goes back in time but instead of regressing in her younger body she goes into another body, so her other self also exists
FL and her future self switch places back and forth, so she travels both to the past and to the future at the same time, in her own younger/older body
For My Own Good