**Takuya Onishi** is a prominent Japanese astronaut with the Japan Aerospace Exploration Agency (JAXA), born in Tokyo in 1975. Selected as an ISS astronaut, he has completed two long-duration missions aboard the International Space Station (ISS), accumulating over 250 days in space.[1] His first mission occurred in 2016 as Flight Engineer for Expeditions 48 and 49, lasting about 113 days. During this time, Onishi became the first Japanese astronaut to capture a Cygnus spacecraft using the Space Station Remote Manipulator System (SSRMS). He also constructed experimental environments in the Kibo module and conducted experiments for JAXA and international partners.[1] In 2025, Onishi flew on SpaceX's Crew-10 mission for Expeditions 72 and 73, spending approximately 146 days on the ISS from March to August. In April 2025, he became the third Japanese astronaut to serve as ISS Commander, following Koichi Wakata and others.[1][2] Onishi participated in NASA's NEEMO-15 undersea mission for extreme environment training and is certified as a JAXA Flight Director. Post-2016, he managed Kibo operations.[1] Recently, in early August 2025, Onishi reunited with fellow JAXA astronaut Kimiya Yui aboard the ISS, sharing a high-five and embrace during Yui's arrival on Crew-11. Onishi welcomed Yui at a ceremony before handing over duties and returning to Earth shortly after.[2][6] Currently, he contributes to JAXA's human spaceflight efforts, including Kibo management.[1] Onishi's achievements highlight Japan's growing role in international space collaboration, with over 500 days collectively logged by Japanese astronauts like Wakata and Noguchi.[1][4] (298 words)