|Japanese name:||清浦 刹那|
In Summer Days, Setsuna is shy and timid, in contrast to her more serious portrayal in School Days. Her mother, Mai, only makes an appearance in Summer Days. With the exception of Kokoro Katsura, Setsuna is the shortest character of the main cast, and is often mistaken for a junior high school student, a trait she is well aware and conscious of. Her birthday and her surname are derived from Kiyoura Keigo.
Spoiler!In the anime, she is forced to leave for France, but, fearing for Sekai, who she knows to be emotionally unstable, places her in the hands of Makoto, who she orders to stay faithful to Sekai. It is soon revealed that Setsuna actually had a crush on Makoto. Her transferring to France, coupled with Makoto's subsequent unfaithfulness to Sekai, left Sekai in a deep emotional depression. It's revealed in the Summer Days game that mother of Setsuna, like Sekai's mother, is the daughter of Makoto's father (that makes her another 'half-sister' of Makoto). So, Makoto is Setsuna's uncle too.
Voiced by: Keiko Imoto