Sakuya Minagami

Kousukes bloodrelated younger sister. A blackhaired beauty. People think she has an uptight personality since she always shows a stern expression. But according to Kousuke she is just very awkward and actually a goodnatured person who always pokes her nose into his matters and helps him. She thinks of herself as not very interesting but that changes whenever she has a conversation with her brother. She mainly communicate with Kousuke through mail ever since she started to live in a school dorm. Like Kousuke she doesnt remember much of her childhood.