HND-856: ຕອນນາງຢູ່ໂຮງຮຽນມັດທະຍົມຕອນປາຍ, ສາວຜົມດໍາຄົນຫນຶ່ງໄດ້ເປີດຕົວນາງ Chiyoko ຜູ້ທີ່ສູນເສຍພົມມະຈັນໃຫ້ລຸງທີ່ບໍ່ຮູ້ຈັກ Mr./Ms. ໃນອຸໂມງຕອນເດີນທາງກັບບ້ານຈາກໂຮງຮຽນ

When she was in junior high school, a black-haired girl debuted Chiyoko who lost her virginity to an unknown uncle Mr./Ms. in the tunnel on her way home from school