Bound by the System: My Accidental Boyfriend
Characters Introduction
Rin Sato (MC / The Host)
Age: 17
Personality: Clumsy, sarcastic, secretly soft-hearted, dramatic when flustered.
Appearance: Messy black hair, glasses, always in hoodies.
Background: Comes from a warm but slightly chaotic household. Always overshadowed by his older sister, he feels “average” compared to everyone around him. Loves gaming.
Secret: Actually very good at drawing but hides it because he’s embarrassed.
Kai Ren (Male Lead / The Target)
Age: 18
Personality: Cold, blunt, quiet, but secretly caring and lonely.
Appearance: Tall, sharp features, silver-dyed hair, always looks perfect in uniform.
Background: Comes from a wealthy but distant family. His parents are successful businesspeople and are rarely home, so he lives with his grandmother. Has a reputation as the “school prince.”
Secret: Loves baking but hides it because it doesn’t fit his “cool” image.
Mother (Emi Sato): Overly cheerful, nosy, always trying to set Rin up with neighbors’ kids.
Father (Taro Sato): Laid-back, enjoys fishing, clueless about Rin’s school drama.
Older Sister (Mika Sato): College student, teases Rin endlessly, but protective of him when needed.
Parents (Mr. & Mrs. Ren): High-powered businesspeople, rarely home. Care for Kai but don’t show affection well.
Grandmother (Ren Aiko): Sweet, old-fashioned, dotes on Kai. Knows her grandson is lonely.
Friends & Side Characters
Haruto (Rin’s Best Friend): Class clown, always hyping Rin up. Ships Rin x Kai the moment he notices the weird tension.
Yumi (Rin’s Childhood Friend): Supportive, kind, sometimes acts like Rin’s “voice of reason.”
Sora (Kai’s Cousin): Mischievous, knows Kai’s secrets, teases him about Rin.
Teacher Ms. Kuroki: Strict but secretly a hopeless romantic. Notices the “odd chemistry” between Rin and Kai.
Ms.Lazy
See you in the next chapter
Chapter 1: The System Awakens
Rin Sato had just finished downloading what he thought was a free manga app. But when he opened it, the screen glitched, and a strange chat window popped up.
System/Fluffy
📢 Congratulations, Host! You are now bound to the [Love Progression System].
🎯 Assigned Target: Kai Ren.
💔 Current Affection Level: -20 (He dislikes you).
Rin Sato(Mc/Host)
HUH?! What the hell is this? Delete, delete, delete!!
System/Fluffy
❌ This app cannot be uninstalled until missions are complete.
Rin Sato(Mc/Host)
No way. Did I just install a virus?!
System/Fluffy
🚨 Mission 1: Greet your Target sweetly before class begins.
Penalty for failure: “I Love You Baby” ringtone will play on maximum volume in front of everyone.
Rin Sato(Mc/Host)
…WHAT?! That’s blackmail!!
[School Group Chat – 07:55 AM]
Rin Sato(Mc/Host)
(hesitates, then types fast) Good morning, Kai~ 🌸✨
Kai Ren(Male Lead/ The target)
…?
Classmate 1
OMG Rin, are you drunk this early? 😂
Classmate 2
Did he just… flirt with Kai??
Haruto(Mc's bf)
LOL Rin you’re bold! I’m proud of you, bro.
System/Fluffy
💖 Target’s affection level: -18 (slightly confused).
Rin Sato(Mc/Host)
He’s going to kill me. I can already feel the death glare.
System/Fluffy
Correction. He’s going to love you ❤️
Rin Sato(Mc/Host)
…I want a refund.
[Private Chat – Rin & Kai]
Kai Ren(Male Lead/ The target)
Why are you suddenly acting weird?
Rin Sato(Mc/Host)
(panicking) It’s… uh… national “Be Nice to Kai Day.”
Kai Ren(Male Lead/ The target)
…Never heard of it.
Kai Ren(Male Lead/ The target)
Don’t bother me.
System/Fluffy
✨ New Mission: Compliment your Target’s hair within 10 minutes.
Penalty for failure: Auto-send “You’re my sunshine 🌞💕” sticker to the entire class group.
Rin Sato(Mc/Host)
…This is actual torture.
And just like that, Rin’s nightmare—and maybe the start of something unexpected—had begun.
Rin Sato(Mc/Host)
I REFUSE. Absolutely not.
System/Fluffy
Then prepare for public humiliation ❤️
Rin Sato(Mc/Host)
…You evil AI.
[Private Chat – Rin & Kai]
Rin Sato(Mc/Host)
(typing… deleting… typing again)
Kai Ren(Male Lead/ The target)
You’re typing too long. What do you want?
Rin Sato(Mc/Host)
Uh… I just noticed your hair…
Kai Ren(Male Lead/ The target)
…
Rin Sato(Mc/Host)
It looks… uh… shiny.
Kai Ren(Male Lead/ The target)
…Shiny?
Rin Sato(Mc/Host)
Like… shampoo commercial shiny.
Kai Ren(Male Lead/ The target)
…
Kai Ren(Male Lead/ The target)
Are you making fun of me?
System/Fluffy
💖 Target’s affection level: -15 (Suspicious, but slightly amused).
[Classroom Group Chat – 08:15 AM]
Classmate 1
LOL Rin just compared Kai to a shampoo ad?? 😂
Classmate 2
I’m LIVING for this drama.
Haruto(Mc's bf)
Bro, keep going! Make him blush!
[Private Chat – Rin & Kai continue]
Kai Ren(Male Lead/ The target)
You’re acting strange. Stay away from me today.
Rin Sato(Mc/Host)
(thinking: If only I could… stupid system!!)
System/Fluffy
08:20 AM
📢 Mission Complete!
Reward: +5 System Points.
🎯 Target’s Affection Level: -15 → -14.
Rin Sato(Mc/Host)
That’s it? All that effort for ONE point?!
System/Fluffy
Every journey starts with a single step 🌸
Rin Sato(Mc/Host)
…I want to throw you into the trash bin.
As Rin sulked, Kai glanced at him from across the classroom. His black hair caught the sunlight, and for the first time, Rin thought he saw the “school prince” looking… puzzled, maybe even curious.
Meanwhile, Rin had no idea this was just the beginning.
The system wasn’t going anywhere. And neither was Kai.
Chapter 2: The Seat Mission
Time skip to the next day
By the next morning, Rin was praying the cursed app had magically disappeared. No such luck.
System/Fluffy
07:40 AM
📢 Good morning, Host! Ready for today’s mission?
🎯 Mission: Sit next to your Target in class.
Penalty for failure: Your search history will be auto-posted to the class group.
Rin Sato(Mc/Host)
WHAT?! That’s invasion of privacy!!
System/Fluffy
Then sit next to him 😊
Rin Sato(Mc/Host)
But he hates me!! He’ll throw me out the window!!
System/Fluffy
Love requires courage 🌸
[Classroom Group Chat – 08:00 AM]
Haruto(Mc's bf)
Yo Rin, wanna sit with me?
Rin Sato(Mc/Host)
Uh… actually… I need to… um…
Classmate 1
He’s hesitating 👀
Classmate 2
Watch him try to sit next to Kai again 😂
[Private Chat – Rin & Kai]
Rin Sato(Mc/Host)
Hey… is this seat taken?
Kai Ren(Male Lead/ The target)
…Yes.
Rin Sato(Mc/Host)
(glances at the empty chair) …By who?
Kai Ren(Male Lead/ The target)
By “Don’t Sit Here.”
Rin Sato(Mc/Host)
…That’s not a person.
Kai Ren(Male Lead/ The target)
Exactly.
System/Fluffy
⚠️ Warning: Mission will fail in 1 minute.
Rin Sato(Mc/Host)
(panicking): Okay, okay!! I’ll just sit here for a little bit.
Kai Ren(Male Lead/ The target)
Do what you want. Don’t talk to me.
System/Fluffy
🎉 Mission Complete!
Reward: +10 System Points.
🎯 Target’s Affection Level: -14 → -12 (Slightly annoyed, but resigned).
[Classroom Group Chat – 08:15 AM]
Haruto(Mc's bf)
OHHH Rin actually sat next to Kai!! 😆
Classmate 1
Rin’s either brave or suicidal.
Classmate 2
Place your bets—how long before Kai kicks him out?
[Private Chat – Rin & Kai continue]
Kai Ren(Male Lead/ The target)
…Why are you suddenly sticking around me?
Rin Sato(Mc/Host)
(sweating) Because… uh… I want to study seriously this year.
Kai Ren(Male Lead/ The target)
Then sit anywhere else.
Rin Sato(Mc/Host)
…But you’re smart. Maybe I’ll learn something from you?
Kai Ren(Male Lead/ The target)
… (pauses typing)
Kai Ren(Male Lead/ The target)
Fine. Just don’t talk too much.
System/Fluffy
🌸 Bonus unlocked! Sitting next to your Target for the whole day will increase affection by +2.
Rin Sato(Mc/Host)
…I hate you.
System/Fluffy
No you don’t ❤️
Kai didn’t show it, but the corners of his lips twitched ever so slightly. No one dared sit beside him usually—yet Rin had forced his way in.
For once, his desk didn’t feel so empty.
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