While arguing with her husband's lover, the opponent who was furious brought out a knife and injured herself in order to protect herself, and she ended up in prison. Reira, who spends her time as a model prisoner in order to shorten her sentence even by a day, is ordered to do a special service. The activity content was to use anal to relieve the stress of violent criminals. Believing that if he endures it for half a year, he can return to his normal life, he continues to receive butthole training from the guards and prisoners, but...
