When I Let My Runaway Senior Stay at My House, Beautiful Seniors Started Gathering Around Me - Chapter 7: I Want to Be a Big Sister!

Chapter 7: I Want to Be a Big Sister!

“…I’ve stumbled upon an unbelievable scene.”

I was just wandering around aimlessly, yet I saw Arisa-san and… some guy I didn’t know push her away, calling her a “shitty woman.”

“…Her boyfriend?”

Considering Arisa-san’s level as a beautiful gyaru, it wouldn’t be strange if she had one or two boyfriends. In fact, it would be weirder if she didn’t.

Well, but then again, Hinata-san doesn’t have a boyfriend either… If I think about it that way, maybe it’s not that strange… No, just because someone is good-looking doesn’t mean they must have a boyfriend or girlfriend.

“…Huh?”

“…Ah.”

At that moment, Arisa-san, who had started to reach out, lowered her hand and our eyes met.

Even though we had just met during lunch break, witnessing something like that made the situation not just a little, but extremely awkward.

That being said, she was, after all, the quintessential social butterfly senpai.

Arisa-san quickly switched her expression, and perhaps embarrassed that I had seen everything, she approached me with a bashful look.

“Hey, Tsubaki-kun… Looks like you saw something embarrassing.”

“No… um, was that your boyfriend?”

“Nope, not at all. That was my little brother.”

“Ah…”

Now that I think about it, Hinata-san mentioned that before.

“Your stepbrother, right? Hinata-san actually told me about him.”

“Yeah, I heard.”

“…He said some really awful things.”

“Exactly! Listen to this, Tsubaki-kun!!”

Arisa-san rushed over to me and grabbed my hand.

She sat me down on a nearby bench and began explaining how things had ended up like that.

“He used to be such a cute kid, always following me around calling me ‘Big Sis’ and even saying he wanted to marry me.”

“That sounds adorable.”

“Right? Though I never took it seriously, I still loved him as my little brother.”

“But despite all that, he ended up rebelling against you.”

“Exactly! He changed after he started high school, but maybe my appearance had something to do with it.”

“You mean because you’re a gyaru?”

“Yeah, exactly.”

I thought about it.

They had been close since childhood, and he must have trusted her enough to say he wanted to marry her. But then puberty—or maybe just a rebellious phase—kicked in, and it all took a turn for the worse.

“Even if we’re not related by blood, he’s still my little brother, and I want to take care of him. I don’t usually care when he says mean things, but… hearing ‘die’ or ‘disappear’ is a bit much.”

Arisa-san gave a weak smile.

Even if you know someone is just going through a phase, and even if they’re important to you, being told to ‘die’ or ‘disappear’ must hurt. Even as a joke, those words can be painful.

“Yeah, being told to ‘die’ is pretty awful.”

“Right? It really is.”

Arisa-san slumped onto the bench, looking completely drained, so I bought her a juice from a nearby vending machine.

“Here.”

“Oh, really?”

“Yeah.”

“Thanks♪”

I took a sip from my own juice. Arisa-san must have been thirsty too because she drank hers at an equally fast pace.

Once we finished our drinks in silence, Arisa-san spoke up again.

“Well, I guess time will sort things out with my brother. Besides, I’m used to being called a ‘bitch.'”

“You’re used to it…?”

“Well, look at me. I mean, I’ve had a few ex-boyfriends, and it’s not like I’m inexperienced.”

“I see.”

Then, for some reason, she added unnecessary details about how she hadn’t done anything in a while.

“So, Tsubaki-kun, do you also think someone like me is a lost cause?”

“Huh? No, I don’t think that at all.”

That was my honest answer.

To me, both Arisa-san and Hinata-san were people I wouldn’t have interacted with if it weren’t for the way we met. In a way, they felt like people who lived in a different world. But now that I had built a connection with them, I no longer thought that way, and I simply enjoyed my time with Hinata-san.

“I don’t know much about you, and I’m not living under the same roof as your brother. Naturally, our perspectives are different.”

“That’s true.”

“But from my point of view, Arisa-san is beautiful and has a great figure. And seeing the way you interact with Hinata-san really makes you seem like a proper big sister.”

Normally, I’d be too embarrassed to say something like that. But I could say it now, probably because of my experiences with Hinata-san.

“A big sister, huh…”

“Yeah. Like I said, this is just how I see it, but if I were your brother, I think it would be fun and never lonely.”

“Wow… You really say the nicest things. But Tsubaki-kun, do you ever feel lonely?”

“My mom is always busy with work, so she’s not home much.”

“…I see.”

Arisa-san crossed her arms as if thinking about something.

Her large chest lifted slightly as she did, just like how Hinata-san sometimes did. Do girls with big chests always do that?

“Wait… could it be that you brought Hinata home because you were lonely?”

Her question made me pause.

At that time, I was interested in Hinata-san. But as I admitted to her, I also had ulterior motives.

However, what mattered most to me was…

“…Well, after my dad passed away, my mom raised me alone. It must have been really tough, but she still brought me up all by herself.”

“………”

Honestly, talking about this was embarrassing.

But I couldn’t help but feel immense gratitude toward my mom.

And this was necessary to explain what I wanted to say next.

“So I think that’s why I can’t ignore people who are struggling. I won’t deny I had ulterior motives, and as a result, I got involved with Hinata-san. But I was genuinely worried about her.”

Arisa-san listened without interrupting.

She didn’t tease me, she didn’t joke around—she just looked at me seriously.

“So, uh… yeah! That’s how it is! But maybe being lonely wasn’t entirely unrelated either. Since my mom is often away, having Hinata-san around made me feel at ease.”

I spoke quickly, trying to escape from both her gaze and my own embarrassment.

“Anyway, that’s why I thought if I were your brother, I wouldn’t feel lonely.”

“…Hmm, I see… I see, I see.”

Something seemed to click for Arisa-san, and her serious expression turned into a smile.

“…I might have underestimated younger guys.”

“Huh?”

“Hey!”

She suddenly leaned toward me.

I was momentarily distracted by the way her large chest swayed before she dropped an absolutely shocking bombshell.

“I think I want to be your big sister, Tsubaki-kun!”

“…Huh?”

…What is this person saying?

“W-What did you just say…?”

“I said, I want to be your big sister.”

“………”

It wasn’t a mishearing… Wait, big sister!?

At that moment, I thought she was just joking. I had no idea that Arisa-san’s words would lead to something much bigger later on.