HTV-X1 was the first HTV-X cargo spacecraft. It launched on H3 Flight 7 from Tanegashima on October 26, 2025, reached and berthed to the International Space Station on October 30, and remained attached for about four months. After departing on March 7, 2026, it completed three technology-demonstration missions before controlled re-entry and splashdown on May 26–27, 2026 JST, ending a roughly seven-month mission.