I Played The Role Of Demoness (Demon Slayer Fanfic)

Stuck In Time and Space

(Lore will not be accurate.)
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As (Y/n) felt that her head and body were completely lost connection,she peacefully smiled.

She saw the faces of Tanjiro,Obanai and Sanemi.Their eyes are filled with hatred.

'I am sorry all of you.I have no choice.'

'I must go back to my world.'

'I lied to you.'

'So,let's part without emotions.'

'May be this is the best for us?'

'I wish you guys are happy forever.'

With these thoughts,(Y/n) finally closed her eyes.
.
.
.

{Mission Success!Congratulation to the host for playing demoness role perfectly.Your reward is 100 billion dollar.}

In the white space,the cute girl with white colored wings said happily.

"Alright,System.Now,can you send me back to my world?"
(Y/n) said.She want to treat her mother's disease as soon as possible.

{Oke,Host.I will send you back!}

The System waved her hand in the air.The surround space started to ripple and the portal slowly appeared.

{Just walk in ,Host.You will return to your world in next second.I will transfer 100 billion dollar to your bank account.}
The System said.

"Thank you,System."
(Y/n) looked at the System and said.

The System's eyes start to fill with tears but she blinked her eyes quickly.

{You don't need to thank me.I am just doing my mission.Thank you, too.}

"Goodbye,System."

{Farewell,(Y/n).}

The two looked at each other for a while and smiled.

Parting with smile is the best afterall.

Just when (Y/n) about to walk in to the portal,the white space shook violently.Then, the portal disappeared.

(Y/n)-"...."

The System-"....."

"What is happening?!How did the portal disappear?!"
(Y/n) shouted at System.

{Host.I also want to know that too.Let me check.}
The System said.She immediately checked and found out the reason.She said in shock,

"Host,I know the reason.There is one System breaking the time and space rules.So,it effect all the universes.Its is the reason why the portal disappeared."

"Then,you can create new one,right?"

The System looked away with sweating on her face.

(Y/n)'s heart is cold.She asked again,

"You can create new one,right?"

After a long silence,the System answered in pitiful tone.

{N...no.I am afraid that you are going to stay here for a while..may be forever.}

"You little!"

(Y/n) grabbed the System's neck.

{Help!This is child abuse!}
The System screamed.

"Stop talking non-sense!You are not even a child!Do you know how much I suffer during these years?!"

{Yes,I know but this is not my fault!}

"It was you who dragged me here!"

{You agreed to come here when you heard 100 billion dollars!}

"Oh,I remembered you said that there will be no problems and you are expert at crossing worlds.Now,here is the problem!Send me back!"