The System Won't Work Unless I Have Girlfriends

By sunset, I arrive back at my apartment.

"Girlfriend, huh?" I mutter as I unlock the door and step inside.

"Onii-chan, welcome back!"

As I shut the door, I saw a girl with long hair in a side ponytail. She was wearing a tank top and shorts as she leaned back on the sofa, a manga in her hands.

"Yeah, I'm back, Chinatsu. Where's Grandpa?"

"Oh, he said he'll be back tomorrow. Anyway, let's eat. I made ebi furai for dinner."

She's Hayase Chinatsu, my 13-year-old sister. She'll start junior high next month in April. By the way, I'm 15 and entering my last year of junior high school. Anyway, what can I say about her? She is... uh, hyperactive and smart for her age.

About that.

Since I returned from England and started living in Tokyo three years ago, my mom and sister often visit our apartment, despite my father hating me.

You heard right.

So, we have different surnames, even though we're actually siblings.

"Hey, I know this is spring break. But... did you prepare for your entrance exam?" I ask as I put another prawn on my plate.

"Huh?!" My sister slams the table. "You don't like me being here? Trying to kick me out with the excuse of studying? What a sly move. Should I remind you? You've been away from Japan for a year—uwaaa! You devil! You went to get milk and never came back!"

"Are you a kid? And I'm your brother, not your father."

"Shut up! You always bribe me with what? Exactly, your money! That makes you my sugar dad—"

I slide 40,000 yen across the table, and my sister grabs it like lightning, then clings to me like a koala.

"Thank you, Masamune-kun! I love you!"

"Get yourself together. I'm not giving you more than that—get off me! Your breath reeks, damn it!"

"I'm not smelly! Do you know how much I spend on beauty products, huh? You dumbass!"

"Give me back my money, then."

"Just kidding~ Onii-chan is really cool and a kind brother. Let's get married. Mumumuu~"

Gritting my teeth, I push her face away to stop her from getting too close. She's actually trying to kiss me for real. Still, I genuinely care about her and want to spoil her. There are many ways to do that, and my wealth is one of them, so...

"Yehehe! Today's 40k, huh? As expected from my brother~"

I sigh. "Just how much does your father give you?"

"Not much. He gives me 35k a month, but a woman's lifestyle is so expensive as hell. Besides, I've got to spend money on my otaku hobbies too. But thankfully, I've got your wallet—I mean! Kuhum! My brother's love—"

"You little!"

"Kyahahaha!—Ugh! Stop choking my neck! I might become a big M for real—"

I let go of her as she smirks at me.

But then I raise an eyebrow. "Where did you learn that phrase?"

She tilts her head. "Oh! I read it in a light novel recently. The rest is experience."

"Experience?"

She smiles. "Spending time with Onii-chan doesn't count? Still..." she sighs. "I'm serious about it."

I hum. "You're a big M?"

"That's not it, you dummy!" she screams, blushing, then turns serious again. "Please, you have to lessen your work and attend school more. You only come to school to meet the minimum attendance requirement and take exams. I know you're crazy rich, big brother, but you're still not even a high school student. So, Mom said, 'Please enjoy your youth a little.'"

I hummed to myself. As the wise man said, with great power comes great responsibility.

The reason I became this rich was because I worked my ass off to the point where I was barely attending school. It's impossible to live a double life as a normal student and a billionaire at the same time, let alone cultivate a relationship like the system told me to.

Therefore, sacrifice is necessary. Sometimes, I really wish I were Bruce Wayne or something.

"Yeah, I know. Tell Mom not to worry about it."

"You promise, right?"

"Yup."

"For real?!"

Chinatsu grabs my shoulders, shouting in my face with bright eyes.

"Uh-huh..."

"Very good! Let's go on a date every day!"

Narrowing my eyes, I reply, "You said school, not a date. You just want to squeeze more money out of me, right?"

She looks away, saying, "W-what do you mean? Isn't that a better option than having a boyfriend?"

"Nuh-uh."

"Damn it! How dare you reject my curvaceous body!" she says, grabbing my collar.

I'm tired. I can't handle my sister well. I continue eating dinner while she nags beside me. As time passes, we clean up the dishes together.

"I noticed Onii-chan has become more handsome now, huh? It's like that chubby Masamune-kun never existed."

"Thank you."

"Hmph! What a shame. You know, I've been thinking about this. We might share the same overall vibe, but Onii-chan is a carbon copy of Dad, and I take after Mom. And... legally speaking, we're not siblings, right?"

I nod. "Okay, and?"

"Wanna be my boyfriend for a moment?"

I stop washing the plate and turn to her, bewildered. "Pardon?"

She pouts. "You heard me right. Don't tell me you're deaf."

What has she been reading? I'm curious. Over the past four years since I returned, I know she's been clingy, but now her jokes are going too far.

"Chinatsu, that's not funny. There's no way I'm dating my little sister. Incest is insanity."

Grabbing my collar, she said passionately, "You fool! It's even better if we're blood-related! We have this cool backstory—a useless older sibling comes back to save his genius and beautiful little sister. It's exactly like the light novel I've been following since its release. Besides, are you telling me you won't take responsibility? Sometimes, I want to show off too, you know."

"We've already done that before. For context, let's just hang out somewhere like we used to. But just to be clear, we're not dating."

She pouts. "How boring."

Seeing this I smil—

[Would you like to see your potential partner rating?]

What the hell? Are you kidding me, System? She's my actual blood-related sibling.

[Okay, and?]

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