|Manga Debut||Volume 1, Chapter 1|
|Anime Debut||Episode 1|
Seijaku Ibusuki (指宿 静寂, Ibusuki Seijaku) is a senior classman of Hakoniwa Academy and one of the delinquents who originally made up both the Kendo Club and the 2% of the votes that Medaka Kurokami did not receive.
Ibusuki ignores the great majority of school rules, instead hanging out in the kendo hall with his friends. Like the rest of his gang, he smokes. After Medaka's intervention however, he seems to have reformed somewhat, and the passion for kendo he once had has been rekindled.
Ibusuki foregoes the uniform of a student of Hakoniwa Academy, instead wearing a dark pink jersey and dark pants. He has long, spiked up blonde hair and brown eyes. He is also seen in his kendo uniform.
Student Council Executive Arc
Ibusuki is hanging out at the Kendo Hall when Medaka and Zenkichi Hitoyoshi arrive. At Mahibi Moji's order, he and the others surround the pair. He is amazed when Medaka manages to confiscate the cigarettes of everyone present before they can react. He is horrified when Medaka declares she will reform all of them. The next day, the group returns to the kendo hall in uniform, much to Zenkichi's surprise. After Medaka leaves to attend the Student Council Recruitment meeting, the Kendo Club is attacked by Habataki Hyūga, who defeats them all. To Hyūga's shock, Moji gets back up, proclaiming that even he was once passionate about kendo. Inspired, the other members rise back up as well. An enraged Hyūga attacks them, only to be stopped by Zenkichi. After being "converted" by Medaka, Hyūga takes over the Kendo Club and shares the hall with the other members, though he and Moji sometimes butt heads.
After Myouri Unzen blows up the Student Council office, Ibusuki and several other members of the Kendo Club hear the commotion, though they assume it is simply Medaka being up to her usual antics.
Bouquet Toss To The Future Arc
Ibusuki is among the students who confront Medaka at the beginning of the 100 Flowers Run, holding flower number ten. He and the others are all blown away by Medaka's Kurokami Final. All present wonder if Medaka thinks of their time together as good memories. His message to Medaka is that kendo is fun.