The 20th installment of the series featuring two big-titted girls. Reia Aihara, who fell asleep at someone else's house by mistake. The homeowner is a perverted man, and Reia has diarrhea due to excessive drinking. There is no toilet in the house, and she accidentally defecates in front of the perverted man. Reia is tied to a chair with her body folded, facing intense bowel movements. Midori Asuka is also tied up in a similar manner, enduring the urge to defecate with her body folded. Her pure white underwear turns yellow-brown due to her suffering. The two girls empathize with each other's situation and try to figure out how to escape from this state, and the process is depicted.