新島早苗

私立、鹿島學園三年生。
せりなの先輩。変わり者揃いなせりなの知り合いの中でも、ピカイチの変わり者。『ゴーイングマイウェイ』な性格で、趣味のストリートダンスに熱中していて、滅多に學校に姿を見せない。非常に心優しい女の子だが、行動が奇抜なために、せりなたち以外あまり親しい友人がいない。自分のことを『ボク』と呼ぶのは、お約束か。

A third year student in the Kashima school and Serina's senpai.

Despite Serina having weird acquaintances, Sanae still stands out as one of the most eccentric. She's a character always "moving at her own pace", and is totally nuts toward street dancing. She can rarely be seen at school. A really kindhearted girl, but due to her unusual behavior, her only close friends are Serina and co.