Toaru Majutsu no Index SS: Kanzaki - Chapter 5: Marine Prison. NAGLFAR.

Three Days of Happiness is a novel by Sugaru Miaki, also known as Fafoo. It’s a rewritten version of the story originally posted to 2ch.

The premise of the story revolves around a shop where one can sell away the remaining years of their life, and the consequences of doing so.

“I Say A Little Prayer” is a short related story which was posted along with the novel’s release. It spoils some things about the main story, but nothing major.

Qingyun found herself having traveled back in time to ancient days, with a splitting headache. She hadn't activated any ancient survival skills!She couldn't compose poetry or engage in literary exchanges.Sewing and embroidery? No clue.Pleasing men? Even worse.Farming or doing business? Clueless.With no other options, she had to choose a profession that required none of the above skills....Years later, those who once served her, now ministers and generals, listened as Qingyun, who had ascended to the throne as the empress, said: 'You might not believe it, but I never intended to be the empress.'The ministers and generals replied, 'That's right, that's right. Everything you say is correct. It was us who forced you into this position.'

She is the underworld Ghost Doctor’s only disciple, who accidentally transmigrated into the body of the main wife’s daughter in the general’s mansion. She used to be a punching bag.Now, she stepped on her dregs of an older sister, put her father’s concubine in her place, and teaches any objectionable aristocratic ladies a lesson.

Her days are rather free and unfettered. But when did that cold as ice prince from the rumors, sporting a deadpan face all day long, fix his gaze on her?
He unexpectedly fawned and pandered to her like a devoted dog?

“Go away, you rotten man! Careful or I’ll needle you like a pin cushion!”

“Wife, why are you so fierce? As a husband, I’m so scared”
….the man is all smiles as he approached, his eyes gleaming with a cunning light.

- Description from Novelupdates

Xin Yan was betrayed in her past life, brutally killed by her boyfriend and her best friend.But she didn't expect to get reincarnated.“In this life, I will plot my revenge against those who have harmed I and my family,” Xin Yan vowed.“Darling, don't you need me to help,” a coquettish male lead asked.Xin Yan felt her scalp tingle as she gritted her teeth.“Fine,” it wasn't bad to have someone take revenge on her behalf, was it?Have questions?