PPPE-334 A busty track team member undergoes intense training at a physical conditioning camp, pushing through a near-1 cm air-chair drill. Over three days and two nights, Karen Yuzuriha gets caught up in a riding-style pose due to the weight of her chest.

Karen aims to compete at the national level in track and field. Her abusive coach, under the pretense of strength training, orders her to do squats and wall sits, then tries to take advantage of her when she is exhausted. Karen trembles from the buildup of fatigue but desperately endures it, only for her large bust to work against her and push her thigh muscles to their limit. At last, the coach forces himself on her, and she is unable to hold the line any longer as he continues to push forward.