Saint Liliana High School second-year student and the Vice-President of the Student Council, and the daughter of the owner of Nasuhara industry, a world-wide company. Anastasia has Russian and American parents. She has a cold personality and often asks strange questions, such as asking Akito if he is a cherry boy when they first met. She is the rival of Akiko and is proud of that she wins a small bit on almost everything, including height, grades, breast size, the rank during Miss Saint Liliana High School Election, and Student Council rank. However, she is extremely weak at house chores due to her wealthy family, to the point that she will gladly admit it and escape her chores. She also loves cute things, and not only keeps lots of plush dolls in her room, but also love to play with Arisa.
Despite being a rival of Akiko, she goes very well with Akito and confessed to him on his first day to school. Although Akito hasn't gotten a chance to answer due to the chaotic situation that the confession brings on afterwards.
Anastasia demands that Akito calls her Ana, but laughs at him for calling a girl "hole" (because Ana means hole in Japanese) whenever he does so.