The H-II Transfer Vehicle (HTV) KOUNOTORI 9 (HTV9) is the ninth mission of the H-II Transfer Vehicle, an unmanned cargo spacecraft developed by the Japan Aerospace Exploration Agency (JAXA). The HTV series, also known as KOUNOTORI ("white stork" in Japanese), is designed to deliver supplies to the International Space Station (ISS). The HTV9 mission represents a significant contribution by JAXA to the International Space Station program. By delivering essential supplies and demonstrating advanced space technology, HTV9 helps ensure the continued success of the ISS and its research activities. The HTV series, with its high cargo capacity and reliable performance, remains a vital component of the international efforts to maintain and utilize the ISS.