Sweet Blue Flowers: Shinako Sugimoto

 Shinako is the oldest of the Sugimoto sisters and was quite popular when she was in school.  She likes to tease Yasuko.

Sweet Blue Flowers: Kazusa Sugimoto

 Kazusa is an artist who was an art teacher at Fujigaya.  While teaching there she met her future  husband Masanori Kagami.  She has a kind personality and still gives private art lessons.

Sweet Blue Flowers: Yasuko Sugimoto

 Yasuko is a third year student at Matsuoka High School.  She is the captain of the basketball team and is quite popular.  She use to attend Fujigaya High School, however after being rejected by a teacher she had a crush on she switched high schools.  She dated Fumi for a short time that didn't end well.