Satou, Sei

佐藤聖

Although Sei is a non-conformist among the regular girls at Lillian Jogakuen, she is one of the wisest and most caring characters on the show. While she appears to have a playful and laid-back attitude, she has endured many tragedies in her life, particularly during her second year.
Sei is known for doing things at her own pace and dislikes being pressured into making decisions or taking action. In her third year, she took Toudou Shimako as her soeur. Her relationship with the first-year student is characterized by mutual understanding and selective support. However, Sei shares an especially close bond with Yumi, becoming a source of comfort, an emotional outlet, a close friend, and a mentor for her.
Others often notice her unconventional looks, with many strangers assuming she is a model. Sei is not purely Japanese; she has Anglo features, evident in her hair and eye color as well as her Caucasian facial bone structure.
After leaving Lillian, Sei studies English and American Literature. This choice may stem from the bibliophile habits she developed during her second year at Lillian, when she immersed herself in reading as a form of escapism and an attempt to understand her conflicting emotions at that time.
She drives a yellow Beetle and is a terrible driver.