At Tokyo Metropolitan K Gakuin Women's Division, students are required to submit a 'Penchin Observation Diary' as part of their extracurricular classes. Please enjoy the expressions of school girls, such as those who are surprised at the difference between the floppy state and the erection, and those who see the glans and neck from a close distance and admire the detailed structure. Touch, smell, lick, stimulate, and thoroughly observe the amount and taste of sperm after ejaculation, and observe the penis in various ways.