BTW for those who can't read Japanese, this is actually a choose-your-own-adventure kind of thing. At the bottom of some pages there are choices and it tells you which part to go to based on what you choose (the parts are marked with a big number in the upper corner of the page). Sometimes there's red text which gives you perversion points.
On page 3 (end of part 1): if you walk down the third floor hallway, go to part 2; if you go down the stairs, go to part 3 On page 5 (end of part 2): if you go down the stairs, go to part 3; if you walk in front of the classroom, go to part 4 On page 7 (end of part 3): if you go outside, go to part 6; if you go to the men's restroom, go to part 7 On page 9 (end of part 4): if you go to the staircase, go to part 3; if you continue masturbating, go to part 11 On page 11 (end of part 5): if you go to the front entrance, go to part 6; if you keep going down the hallway, go to part 12 On page 13 (end of part 6): if you leave the school, go to part 10; if you go to the back yard of the school, go to part 8 On page 17 (end of part 8): if you have 5 or fewer perversion points, go to part 14; if you have 6 or more, go to part 13 On page 19 (end of part 9): End On page 21 (end of part 10): if you go back to the school, go to part 8; if you keep going, go to part 9 On page 23 (end of part 11): End On page 25 (end of part 12): End On page 27 (end of part 13): End On page 28 (end of part 14): End