Unaware, but with unforeseen consequences

No, an unaware effect would be better. They may get suspicious about what was happening, otherwise. They'll be completely oblivious that anything is wrong for these oncoming three days and then, starting next week, they may come to terms with what HE has to go through every day for years now.

Writing on, he added:

"For the next 72 hours, the scales of perversion will be inverted. The most perverted individual will become the least perverted individual and vice versa. However, a girl will always be more perverted than a guy."
"While the previous entry is in effect, no one will be aware that anything is different. The world and their memories will change to match the new reality. Only once the previous entry is over will everything return to how it was before."

As an extra precaution, Mineta wrote one last thing:

"No one will suspect that this book is anything over than a regular notebook that Mineta has recently bought. They won't think it's magical or at all related to any of the things it causes to happen."

He couldn't risk using this book in the meantime and have people getting suspicious, now could he?

He finally placed down his pencil and shut the book to get ready for his day of fun and payback.

However, as soon as he did, he felt a wave of nausea rush over him, almost causing him to stumble out of his chair. It was the same kind of feeling one got when they stand up too fast. Mineta felt his vision blur and a loud ringing resounding in his ears for a second.

At once, it passed and Mineta righted himself. He felt just as he did before. That incident quickly losing weight in his mind as he quickly forgot all about it.

Mineta shook his head, wondering what he had been doing. He had been writing in...

Of course, his new Notebook. He had recently bought it, hadn't he? Yes, that was it. He looked down at the ornate cover and grand size of his new purchase, wondering what about it had drawn him in. A standard academic notebook would have been fine. Yet, Mineta had chosen to buy a TOMB that looked like it had come from a library from Ancient Babylonia. Now that he thought about it, he couldn't even remember from where he had got it nor how much it had actually cost him.

Mineta shrugged. It didn't matter; it was his notebook now, so he may as well use it.

Mineta's mind vaguely recalled something important, but he couldn't grasp it. What was it?

He looked down and saw that his... member was out. He blushed and looked around panickily pushing it back into his boxers. How did that happen? It must have slipped out by accident.

(If only he had remembered the horse cock he had given himself only a couple of minutes prior, but that memory was no longer present in his mind.)

Checking the time, he saw it read: 8:10 AM. Class would start soon, so he should get prepared. He was quite proud to be one of the top 10 students in their class. He found he could focus pretty well, academically, in comparison to the other students. Especially... huh, the girls.

Oh, how hard was it for them to get their heads out of the gutter? They astounded him, sometimes.