Using a Mysterious Spellbook Ended Up Creating a Slave Harem - Chapter 1

The Item Inherited from an Elderly Relative

In front of a certain apartment building—about an hour’s commute from my house by train and on foot—I, Atsushi Saida, was desperately trying to steady my breathing.

(Calm down! The preparations are flawless!)

(I’ve already heavily tampered with Iroha-sensei’s emotions using mind-attribute magic, and I’ve completely mastered the crest magic! ...Probably.)

(It's fine. Today is definitely the day I lose my virginity! And then, I'm going to make Iroha-sensei my sex slave!!)

Desperately suppressing my heart, which felt ready to burst with excitement, I began walking toward the apartment's common entrance. All the while, believing that from this moment on, my future was about to undergo a tremendous transformation...

When I was in the fifth grade, an old relative of mine who lived nearby passed away. He was famous for being an eccentric and was pretty much disliked by everyone in the family. Even from my perspective, he was an old man shrouded in a lot of inexplicable mysteries, but for some reason, he and I hit it off, and he doted on me completely.

He was always inexplicably flush with cash and constantly gave me allowance money. Having developed a taste for that, I kept visiting the old man's house, where he lived alone.

When I showed up a few days before he died, he handed me a sealed paper bag right as I was about to leave. He told me, "Open this when I die," to which I replied, "But you're still so full of energy, you're nowhere near dying," and he just laughed. A few days later, when I came home from elementary school, my mother told me that the old man had collapsed and passed away. Remembering what had happened just a few days prior, I recall being shocked, wondering if he had somehow known he was going to die. It seemed he had indeed known, as various affairs and belongings had been sorted out and disposed of ahead of time, which deeply creeped out the adult relatives.

While the adults were frantically running around handling the funeral arrangements, I, being a kid, had nothing to do and decided to open the paper bag the old man had given me. Looking inside, it appeared to contain books. When I pulled everything out, the contents consisted of a few old notebooks, about ten book-like objects written in archaic characters, and a single ordinary envelope. Checking the envelope first, it turned out to be a letter addressed to me from my late grandfather.

When I read it, the contents seemed absurd. It claimed that the eleven old books were spellbooks, and the notebooks contained the portions of the spellbooks he had managed to decode. Apparently, the old man had mastered precognition magic through these spellbooks and used it to rake in cash through gambling. Unfortunately, since he had acquired the spellbooks late in life, he couldn’t spend enough time analyzing them, so he was leaving the rest to me. Is the old man seriously messing with me using stuff like this? I thought as I read on, but at the very end, it said, "Since you probably don't believe me, I'll clear your doubts," followed by a method to prove it. That method also involved gambling—specifically, it listed the winning horses for every single race happening that weekend.

Deciding that whether this was a joke or the real deal depended entirely on the weekend, I checked the results in the newspaper. To my amazement, every single race listed had won. Realizing this might actually be real, I seriously began reading the spellbooks and notebooks.

Since the old man had decoded what looked like sub-headers, I started by deciphering the items I was personally interested in. Using the notebooks as a reference, the first thing I looked for was magic that could improve my school grades.

Spending several months on it, I managed to decode and master a spell that temporarily boosted my mental processing speed and memory. While using that magic on myself, I pushed further with my decoding and eventually decoded and mastered a spell that permanently grew my mental processing speed and memory. The former provided a massive boost, but once the magic wore off, you went back to normal. The latter, conversely, provided a miniscule amount of growth, but the portion that improved would never decrease.

Using those spells to accelerate my decoding speed, I continued to master even more new magic. Magic that grew my physical abilities, magic that let me understand others' emotions, magic that let me manipulate others' emotions—albeit just a little—and various other spells.

As I progressed through decoding the spellbooks, I entered middle school, and my interest in women began to grow. To help with that, I also mastered and utilized spells that increased my charm as a man, increased my height, and emitted male pheromones.

By the time I became a second-year middle school student, perhaps thanks to the magic that grew my mental processing and memory, my grades became outstanding. I was recommended to aim for the advanced academic track at Private K University High School, the top school in the region. My parents got on board too, and one day, they brought home a tutor.

Iroha Soejima. She was a first-year student in the literature department at Private K University and a graduate of the very same advanced track at Private K University High School that I was being pushed toward. However, at first glance, she didn't look like a university student at all. Her appearance was that of a cute, slender girl who wasn't even 150 cm tall and could easily pass for a middle schooler. While her face was undeniably beautiful, it was expressionless, and she looked at me with cold eyes. When I secretly used my emotion-appraisal magic, I detected a strong sense of disgust directed solely at me and my father, leading me to conclude that she simply hated men.

In the end, it was decided that she would tutor me twice a week, initially just for the first semester. Since I didn't have any particularly weak subjects, it was more of a general oversight of my studies. Her beauty stirred my desires, and during our tutoring sessions, I continuously cast magic on her to increase her goodwill and affection toward me. Fortunately, the other students Sensei was tutoring gave up on aiming for K University High and dropped out, so I was the only one left, and her tutoring continued into the second semester and beyond.

By the time I advanced to my third year of middle school, the continuous effects of the magic had caused her to soften up considerably. When I asked Sensei about the high school, she told me that while the advanced track was a good place if you only cared about studying, she didn't have very good memories of it. She mentioned there was also a general track and an entertainment track, and since those classes were merged, it looked like a lot of fun from her perspective. She advised me that judging by what she'd seen of me over the past year, I could get into a good university even from the general track, so the general track was a viable option.

As the exams drew near, Sensei would show me radiant smiles and even make handmade sweets to reward my hard work. Ultimately, the deciding factor for my high school entrance exam was the fact that my classes would be combined with the entertainment track, so I chose to take the exam for Private K University High School's general track. My parents and middle school teachers strongly urged me to take the advanced track exam, but dreaming of being in the same class as cute idols from the entertainment track, I flatly refused. As a guy, that's only natural. Just as my appraisal had determined—showing that I was guaranteed to pass if I performed at my usual level—I passed the exam without a hitch. This, too, was thanks to the mysterious spellbook.

Iroha-sensei was particularly overjoyed. Apparently, tutors who had a student pass the exam for an ultra-difficult high school received a cash bonus. Perhaps because of that, it was decided that we would celebrate by having her cook a home-cooked meal for just the two of us. However, our schedules didn't align until the first Sunday of April, right before the entrance ceremony, making it a celebratory feast for both my middle school graduation and high school enrollment.

And that brings us back to the beginning.

Right now, I’m standing in front of Iroha-sensei’s room, just about to ring the intercom. Because I couldn't stop shaking with excitement thinking about what comes next, I used a calming spell on myself to somehow maintain my composure. I press the button, the chime rings, and a lovely voice comes through the intercom.

"Yes? Who is it?"

"Good morning. It's Saida." 

"I've been waiting for you! I'll open up right away."

The sound of a lock turning echoes, and the front door swings open. Iroha-sensei steps out from inside, flashing a warm, radiant smile at me. Compared to me—having recently cleared 170 cm in height—she stands at a petite 148 cm. As a result, we end up facing each other with me looking down at her.

"Welcome, Atsushi-kun." 

"...Thank you for inviting me today." 

"Oh, stop it, you're the guest of honor today!" 

"I guess that's true." 

"Well then, hurry on in." 

"Yes. Excuse me."

Swishing her straight black hair, which reaches down to her shoulder blades, Iroha-sensei invites me inside. Concealing a dark, murky wave of sexual desire, I stepped into her apartment, which carried the distinct scent of her everyday life. Iroha-sensei locks the deadbolt behind us and heads deeper into the apartment. With my breathing slipping slightly out of rhythm at the realization that we are completely alone in a locked room, I followed her small figure from behind, heading further inside.

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