I Asked A Beautiful Girl, Who Was About To Jump Off The School Rooftop, 'If You're Going To Die Anyway, Could You At Least Take My Virginity Before You Go?' To My Surprise, She Agreed.

My Younger Sister Is Captivated By The Most Beautiful Girl In High School.

At Mayuki’s request, the three of us ended up studying together.

Mayuki brought her study materials into my room and, once again, claimed the seat between Hatsune and me.

“That problem can be easily solved using this formula, not the one you’re looking at,” Hatsune explained.

“I see…”

Mayuki nodded in agreement, satisfied with the explanation. This had been the pattern for a while now—Mayuki asking questions, and Hatsune answering them with precision.

“I originally came here to keep an eye on my brother, but I’m actually learning something…” Mayuki mumbled, showing no hesitation.

“Keep an eye on me? What do you mean?” I asked.

“Just like it sounds. If I leave you alone with your girlfriend, you’re likely to do something weird. So, I’m here to make sure that doesn’t happen,” Mayuki answered, unfazed by my question.

What does she think I am…? I almost protested, but then paused. Thinking back to the times when Hatsune and I had been alone in her room and the things that had happened, including staying out all night, I found I had no room to argue.

“Mayuki-chan, you’re quite attached to your brother, aren’t you?” Hatsune suddenly said, watching our exchange.

“Wh-what? I don’t care about him at all!” Mayuki hastily denied.

“I feel like you’ve been treating me pretty coldly most of the time,” I chimed in.

“If you didn’t care about your brother, I don’t think you’d check in on him so often when he comes home late,” Hatsune remarked with a soft smile.

“Is she… actually worried about me?” I wondered, almost convinced by Hatsune’s words.

“I-I don’t worry about him at all…!” Mayuki stubbornly retorted.

“Fuufuuu~~, you’re so cute when you’re embarrassed, Mayuki-chan.”

“Being called cute doesn’t make me happy at all…!”

“Really? Your face is red, though,” Hatsune teased with a playful smile.

It seems that Hatsune has really taken a liking to Mayuki. She was teasing her with a lively expression.

“I-I’m not blushing!” Mayuki protested.

“Hmm, making such a cute and sweet girl worry… Yakumo-kun, you’re a guilty older brother. Though I guess I’m an accomplice too,” Hatsune added with a mischievous grin.

“I’m not worried about him at all… Wait, accomplice?” Mayuki responded, confused by the word “accomplice.”

But before she could get an explanation, Hatsune moved closer with her arms outstretched.

“Well then, how about I make it up to you by giving you a hug?”

“N-No! And that’s not an apology; you just want to hug me!” Mayuki backed away quickly, trying to escape.

However, as she moved, she unintentionally shifted toward me. Already seated close, Mayuki ended up leaning back against my body, her small frame nestled into me as if she were sitting in my lap.

“Uh, Mayuki?” I glanced down at her, and our eyes met.

Now I understood. From this angle, I could finally see her face clearly—her cheeks were definitely flushed red.

“Uh… um… aah…” Mayuki stammered, clearly not expecting this outcome.

“Oh, I see. You didn’t want me to hug you; you wanted Yakumo-kun to do it instead, huh?” Hatsune teased with a grin.

“T-That’s not true!” Mayuki, regaining some composure, immediately denied it, shooting me a glare.

“Listen, Onii-chan, this is just an accident, okay? And when I text you when you’re late, it doesn’t mean anything special either!” Mayuki pressed, her voice firm, though she remained leaning against me.

Despite her sharp words, I could tell that her behavior was a lot softer compared to the time before our otherworldly adventure when we barely spoke to each other. Hatsune was right—Mayuki does worry about me in her own way.

“Thanks for always looking out for me, Mayuki. And I’m sorry.”

“…If you really mean that, then come home on time or at least send a message,” she murmured, her gaze dropping.

“I’ll be more careful…” I replied. It was about time I reflected seriously on my actions.

“I think I teased you a little too much too. I’m sorry, Mayuki-chan,” Hatsune followed up, her tone sincere.

“…Since I got something good out of it, I’ll let it slide this time,” Mayuki muttered, still avoiding eye contact, but it was clear she wasn’t upset anymore. As she spoke, she leaned her full weight against me.

***

After taking a moment to regroup, we continued our study session.

It seemed that Mayuki was making significant progress in her exam preparation by asking Hatsune questions.

“I’m starting to understand things I didn’t get until yesterday… Hatsune-san, you’re really smart,” Mayuki remarked, her admiration clear.

“Hehe, thanks!” Hatsune replied cheerfully.

“Of course, Hatsune-san always scores at the top of her class. It’s only natural that she’s smart,” I added.

“Oh…,” Mayuki said, her eyes wide with genuine admiration.

“If we’re talking about academic ability, I think Mayuki-chan is quite impressive too! If you keep studying like this, you’ll easily pass our high school entrance exams,” Hatsune encouraged.

“Is that so…?” Mayuki replied, her doubt evident.

“Yes! So let’s work hard together so we can go to the same high school next year. I’ll always be here to help you,” Hatsune assured her with a warm smile.

“…Thank you,” Mayuki said, her gratitude sincere.

“You’re surprisingly honest,” I remarked.

“Well, it’s because Hatsune-san is genuinely kind, smart, cute, and smells nice,” Mayuki complimented, her tone a bit begrudging.

I was surprised by how highly she praised Hatsune. I had thought Mayuki might feel overwhelmed by Hatsune’s attentiveness, but it seemed she had a good impression of her after all. Maybe Hatsune’s sweet treats and tutoring had won her over?

“Fuufuu~. I didn’t know Mayuki-chan thought of me that way,” Hatsune said, her expression gleeful.

“Though I do wonder why you tease me so much,” Mayuki added, maintaining a straight face despite the praise.

***

From that point on, the three of us immersed ourselves in our studies, and before we knew it, it was evening.

It was almost time for Hatsune to head home.

I decided to escort her to the station.

Mayuki came to see us off at the entrance.

“Hatsune-san… please come again,” Mayuki said earnestly.

“…! Yes!” Hatsune replied, her face lighting up with a beaming smile.

“Oh, by the way, Mayuki-chan, let’s exchange contact information,” Hatsune suggested.

“Yes, let’s do that,” Mayuki responded, now completely at ease as she took out her smartphone.

The two exchanged LINE contacts.