[This video was shot with full consent of the model. The model was assured that she can pause or terminate the shooting and be released from any risky circumstances at any moment, by using predefined signals including but not limited to safe-words and safe-moves. WARNING: The video features performance by either professionals or under the supervision of professionals. Do not attempt to recreate any actions similar to the ones that appear in this video. No solo breathplay. NEVER.] As the title suggests, this is a one-take video without editing on the breathplay content. Xiaoyu-senpai was restricted to a breathplay “marathon” for nearly an unbreak 30 minutes! Xiaoyu was wearing a Japanese one-piece school swimsuit and bound to a chair by tape. Her hands were tied and invalid by tape wraps as well. A ventilation bag was very tightly secured on her head with packing tape wrapping around her neck several times. The setup of the game is quite simple: Close and open the lid of the ventilation pipe several times according to a timetable. The time of closing started from 1 minute and increased by roughly 10 seconds each round, and the time of opening was fixed to about 20 seconds. It was very easy at the beginning, but during each round Xiaoyu accumulated more carbon dioxide in her body, and the increasing time of closing only made the situation worse. You can enjoy a lot of heavy breathing sound, and also screams at the later phase of the game from her. Finally she didn’t reach her goal of about 2.5 minutes in Round 9, and I punished her by pouring water into the bag through the ventilation pipe! Poor Xiaoyu was so weak already, and her gasp for fresh air made her impossible to hold her breath at all, not even for a few seconds. She instantly inhaled water and started coughing. Xiaoyu collapsed completely through the tough game and ended this show with crying…