A captivating work that begins with the anal sensitivity training of a female student, gradually expanding her sensations. Using a dildo to stretch her anus and carefully inserting fingers to slowly open her up, the realistic process is intensely arousing. Her innocent reactions are met with meticulous anal development, showcasing a high level of fetishistic quality. The sight of her in a sailor uniform with her anus fully opened is profoundly alluring. Filmed in a dark, hidden warehouse in Yokohama, this title has gained immense popularity among fans of anal-themed content.