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My System is My Ex-Girlfriend

DanielXYZ
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Synopsis
Yuuto Kisaragi thought his biggest problem was running out of instant ramen. That was until he woke up in a strange new world—one filled with magic, monsters, and dungeons. As if being isekai’d wasn’t bad enough, his assigned support system turns out to be his smug, insufferable ex-girlfriend, Celia Nightshade. Bound to the Ex-Girlfriend System, Yuuto is forced to rely on Celia’s ‘guidance’ to survive. But with ridiculous missions like calling her his "Goddess" just to earn experience, his new life quickly spirals into an inescapable nightmare. Between dealing with an overpowered, petty ex-girlfriend and navigating a world that seems to want him dead, Yuuto must find a way to level up, break free, and maybe—just maybe—get revenge. But Celia isn't just any ex. She has secrets, a mysterious past, and an agenda of her own. The real question is: Who’s truly in control—Yuuto, or the Ex-Girlfriend System?
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Chapter 1 - Chapter 1 – Welcome to Hell, Yuuto

[System Initialization…]

[Welcome, Yuuto Kisaragi. Your System has been successfully bound.]

[System Type: Ex-Girlfriend System]

[System Administrator: Celia Nightshade]

Yuuto Kisaragi blinked. His head throbbed as if someone had just smashed a brick against his skull. The last thing he remembered was crossing the street after buying instant ramen—and now, he was waking up in an unfamiliar place.

The sky above was an unnatural shade of deep purple, swirling with ethereal clouds. His body felt… different. He was lying on cold, grassy terrain, and the scent of damp earth filled his nose.

Where the hell was he?

A sharp, mocking voice cut through his disoriented thoughts.

"Hah! So it finally worked. I was hoping you'd stay unconscious forever, but I guess even you aren't that lucky."

Yuuto's blood ran cold. That voice—he knew it all too well. A voice he never wanted to hear again.

Slowly, he turned his head, his mind still struggling to process what was happening.

Floating above him, arms crossed, was a ghostly figure of his ex-girlfriend, Celia Nightshade.

She looked exactly the same as he remembered—long silver hair cascading past her shoulders, piercing golden eyes that radiated superiority, and an ever-present smirk that made him want to punch a wall. But unlike before, she was slightly translucent, glowing with a faint blue aura, as if she were some kind of spectral being.

"Celia?!" Yuuto gasped. "What the hell are you doing here?!"

Celia sighed dramatically. "Ugh, why do you sound so surprised? Did you really think you could escape me that easily?"

His stomach twisted. This had to be a dream. There was no way this was real.

"Wait, wait, wait—where am I?! Why are you floating?! Why do you look like a freaking hologram?!"

Celia gave him a slow, condescending clap. "Wow. Only took you two minutes to realize something's off. Good job, genius."

Yuuto gritted his teeth. Even in death—or whatever the hell this was—she was still the same sarcastic, insufferable woman he remembered.

Taking a deep breath, he forced himself to focus. Panicking wouldn't help. He needed answers.

"Fine. Just tell me what's going on."

Celia's golden eyes gleamed mischievously. "Congratulations, Yuuto Kisaragi. You've been transported to another world."

Yuuto's brain short-circuited. "...What?"

"You heard me." Celia smirked. "You're in a completely new world now. Magic, monsters, dungeons, all that fun stuff. Oh, and you have a System to help you survive. Sounds great, right?"

A System? Like those things in isekai novels?

[Status Window Activated.]

A blue holographic screen appeared in front of him.

━━━━━━━━━━━━━━━━━━━

[Yuuto Kisaragi – Level 1]

Class: None

Stats:

Strength: 3

Agility: 2

Intelligence: 6

Endurance: 3

Luck: 1

Abilities: None

System: Ex-Girlfriend System (Administrator: Celia Nightshade)

━━━━━━━━━━━━━━━━━━━

Yuuto blinked.

Then blinked again.

"...Ex-Girlfriend System?"

Celia's smirk widened. "That's right. Your one and only support system in this world is me. Your ex-girlfriend."

Yuuto felt like his soul left his body. "ARE YOU FREAKING KIDDING ME?!"

Celia laughed. "Oh, trust me. I wish I was."

---

[System Tutorial: First Mission]

Just as Yuuto was about to collapse from sheer mental exhaustion, another blue notification popped up.

[Main Quest: First Interaction]

Objective: Call Celia 'My Goddess' with genuine sincerity.

Reward: 10 Exp, Minor Stat Boost.

Failure: No System Assistance for 24 Hours.

Yuuto stared at the quest.

Then, he stared at Celia.

Celia was grinning.

"Well?" she said sweetly. "Go on, say it. Call me your goddess, Yuuto~"

Yuuto clenched his fists. This wasn't a system. This was HELL.

---

End of Chapter 1