久保晶子

涼月學園 普通科2年
勝の実妹。前作で雪之丞との戀に破れ、涼月町へと戻ってきた。
意識を取り戻した兄とともに涼月町に戻ってからは、鹿島町にいた頃とは別人のように明るく振る舞っている。今では、すっかり彼女本來の明るさ・優しさを取り戻したように見える。
生活無能力者の兄の面倒を見つつ、勉學にも勵むしっかり者で、兄の勝曰く『容姿端麗、頭脳明晰、性格温厚、料理格別、お掃除大好き無敵の妹』。

Masaru's little sister and Yukinojou's childhood friend. She was the former manager of the boxing club when those two were still active members, even though she did not really enjoy boxing. The thought of her beloved brother and childhood friend "beating" each other always filled her with uneasiness.

Following the accident sending Masaru into coma, she harshly condemned Yukinojou, who was unable to bear this and moved to Kashima city. Short while later Shouko followed him, as she didn't intend to let him off the hook so easily.