Liar x Liar
Directed by Saiji YakumoA step-brother and step-sister live with one another so she fully knows he is a ladies' man and dates and meets women like a baby goes through candy. They are the same age roughly and understand each others' emotional and physical boundaries. However, she is still surprised when he falls in love with her and wants to date her when she dresses as a schoolgirl and he does not recognize her.
