The first time I experienced that was about a month and a half after coming to this other world. It was a little while after I enrolled in school.

  In the room I shared with Alice at the girls' dorm. Sleeping in my bed, I woke up bathed in the soft sunlight streaming through the window. It's a pleasant morning.

  "Mmn," I stretched. While rubbing my sleepy eyes, I casually looked down, and—

  Eh...!?

  I woke up instantly. A part of the sheet was stained bright red. What is this...

  Feeling the blood drain from my face, I stood up unsteadily. Then, I felt something trickling down from my crotch along my thigh. Fearfully, I lifted my skirt.

  It was blood.

  While getting scared, I hurriedly took off my panties. Blood is coming out from my crotch. When did I get such an injury...

  I wiped my crotch repeatedly with a cloth nearby meant for cleaning messes. For now, the surface became clean, but... Maybe the inside is injured; the bleeding won't stop.

  What do I do. What do I do. If the bleeding doesn't stop like this—

  I have to go to the infirmary quickly. No, it's not open yet. Then, maybe I should ask Inea-sensei to heal me.

  At that moment, Alice, who was sleeping in the next bed, woke up.

  "Mmn...! Oh? You're already up. Good morning, Yu."

  Normally I would reply amiably, but right now I didn't have the composure for that.

  "Hm, what's wrong? You look so pale."

  "What do I do... Alice..."

  "What? What happened?"

  "Blood. The blood, it won't stop...!"

  Hearing that, Alice changed her expression and approached me.

  "Are you okay!? Where is the blood coming from!?"

  "F-from here..."

  Feeling a little embarrassed, I pointed to my crotch over my skirt.

  "Eh, there...? How is it bleeding?"

  "Well... it's just a little bit at a time, but it won't stop at all. It's weird."

  Honestly, I was so anxious I was about to cry. Then, her expression changed completely from worried to suddenly bursting into laughter.

  "Pfft... Ahahahaha!"

  What...? What's so funny? I'm telling you it's a serious matter.

  "Ufufufu! Because you said you were bleeding with such a serious face! Ahahaha! I wondered what happened! Fufufu... I see. So it hadn't come for you yet, Yu."

  "What... hadn't come?"

  "Usually it comes earlier, though. Anyway, congratulations. That is proof you've become an adult. Your body is perfectly normal, so you don't have to worry."

  Alice still seemed to be suppressing her laughter. An adult body. Hearing that, a word came to mind. I heard it in Health and Physical Education class.

  "Could this be..."

  "Yeah. It's your period. It happens about once a month and lasts for about a week, so you have to use a napkin during that time or you'll stain things with blood. For today, I'll give you mine, so use it."

  So it was my period!

  Thank goodness. I thought something terrible had happened. I knew the word, but I didn't know anything about the reality. So blood drips like this. I never thought the day would come when I'd experience it personally.

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  "Ah, you have a face saying you're relieved now! So cute. 'The bloood~, it won't stoooop~.' Fufu."

  Alice, imitating me exaggeratedly on purpose, was a tease as always. Good grief.

  "I didn't know..."

  "Your face is bright red. Yu, you act like you're together, but you're kind of ditzy, aren't you?"

  Ugh, I was called ditzy again. I want to become a truly reliable person someday, but I guess I still have a long way to go...

  More importantly, there's a problem. If left alone, Alice will probably tell someone about this. Just like when she spread around that I inadvertently finger-shook Milia with my left hand at the welcome party. The chatty person herself is just amused and never has bad intentions, which makes it worse.

  The only measure I can take against her is one thing.

  "Hey. Please, can you not tell anyone about this?"

  To humble myself and beg. Alice pretended to play dumb deliberately.

  "Hmm. What should I do~"

  "I'll treat you to one dessert at lunch next time!"

  Alice-sama's cheeks relaxed.

  "Yay! Okay. Then I'll keep quiet. Well, I'll tell Milia though."

  "Milia, huh. That girl, once she knows things like this, she teases me bit by bit."

  Despite her quiet appearance, she's unexpectedly the type to have some poison.

  "But no leaving anyone out."

  How much will I be teased? Thinking about it made me a little depressed, but well, if it's just Milia, it's fine.

  "Understood. Let's shake on it."

  "Okay. Deal!"

  I finger-shook with Alice. Finger-shaking can be used for promises like this too. It's quite a versatile communication tool. However, you must never mistake which hand to use.

  After that, Alice taught me how to handle sanitary products and everything. I think I won't embarrass myself anymore.

  By the way, Alice judged from my appearance that my first period (menarche) was today, but I myself don't think so. This body of mine is probably sixteen years old, just like my male body. It should be reasonably mature. Probably, if I had lived in this body since birth, I would have already experienced periods many times.

  Well, either way, it didn't change the fact that it was the first experience for me.

  Still. I looked down at my body again.

  These swollen breasts, and the secret place dripping blood, apparently aren't just decorations. This body can bear children. It really, perfectly, is a female body. I was made to recognize that again.

  If I give birth to someone's child as a woman. Will such a thing happen someday? Right now, I've never thought about having such a relationship with anyone, and honestly, it's hard to imagine.

  —In the end, such worries end up being needless anxiety, though.

  To think I could bear children. To think I could make a new family connected by blood with this body.

  Such things, such dreams.

  For me, who had already transformed into a FabL who is no longer human, it was nothing more than a sweet illusion. But at this time, surprised by my first period and somewhat excited somewhere in my heart, I had no way of knowing yet.

  Next day. The second day of the period.

  On this day, the period cramps were tough above all. Anyway, it hurts. Like a body blow, the pain comes slowly and constantly.

  Born into this world, I'm probably the only one who has tasted both the pain of getting hit in a man's vital spot and a woman's period cramps. I think these are not things that can be compared.

  So, I managed to get through the morning. But in the Magic History class in the afternoon, the pain reached its peak. I always sit in the front row in any class, so my suffering appearance seemed to stand out. Perhaps because I looked very painful, the teacher in charge, Tor Guief, was considerate.

  "Yu-kun, you look somewhat in pain. You may go to the infirmary."

  "No, I'm okay..."

  "Haha, you don't have to force yourself. I'll give you the notes for this part later."

  Honestly, I was at the limit of my endurance, so I was grateful. I decided to accept his kindness obediently.

  "I'm sorry. Then I will do so."

  He looked around the classroom.

  "Someone, please accompany her."

  "Then, I will."

  The one who raised her hand first saying that was Alice.

  "Then, Alice-kun. Please take care of Yu-kun."

  She came over immediately and lent me her shoulder. Despite everything she says, Alice is kind.

  "Thank you."

  "It's totally fine. At first, it might be tough until you get used to it."

  "Honestly, I didn't think it would be this hard."

  "Maybe yours is especially tough, Yu. I heard there are individual differences in these things."

  "I see..."

  And at night.

  When I was about to go to Inea-sensei's place today too, Alice and Milia tried to stop me with all their might.

  "Hey, Yu. I don't know what business you always have, but at least rest for today~"

  "That's right. I'm worried too."

  Indeed, it's tough. But if I skip training with Inea-sensei just because of period cramps, who knows what will happen. Besides, if I can just go. If I just become a man, I'll be released from this pain. So there's no problem.

  "It's business I absolutely can't miss."

  "Then, at least let us accompany you..."

  "Sorry, but I have to go alone."

  I'm sorry, but I can't have them follow me. Because I'm a man when I'm training.

  Forcibly shaking off their restraint, I headed to Inea-sensei's Dojo. I felt bad since they kindly worried about me, but I can't skip training with Sensei.

  When I entered the Dojo as a woman, Sensei also worried about me looking painful. So when I told her the reason, she laughed it off after all.

  When I transformed into a man, naturally, the period cramps disappeared. I was happy inside, but things didn't go so well. Apparently, while I'm a man, the time as a woman is not counted. The end of the period was simply postponed. Too unfortunate. Painful.

  However, it was only the first time that was so tough. From the next time, I got somewhat used to it, and I feel like the pain decreased considerably. Since it was the first period after the female body manifested, maybe the adjustment inside the body was also difficult. My body must have been working hard.