The team, comprising of: Sarah Fitzgerald, Megan Fahy, William Walsh and Emma Hurley, defeated Gaelcholaiste Charraig Ui Leighin on Wednesday night.
The motions for the Concern Debates centre on the UN Sustainable Development Goals.
The KCS team successfully proposed the motion that "Ending world hunger by 2030 is beyond humanity's reach."
Each team member speaks for a maximum of four and a half minutes on the topic, prior to a captain's summation.
The Chief Adjudicator, Miriam Murphy-Wood, complimented the team on their research. The team is mentored by Ms Maria Kennedy, Ms Janet Forrest and Bertie Pearse.
KCS face Mount St Michael's, Rosscarberry in the next debate and will be proposing the motion: "Nuclear power is essential for a clean energy future."