From Overlord To Multiverse. - Chapter 21: Labrinth.

Lin Chen was persecuted by his childhood sweetheart and accidentally obtained an ancient legacy. From then on, he embarked on a path against the heavens!“I am a sovereign! Those who insult me will be killed, those who obstruct me will die!”

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

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.

After he bought some Dragon Balls online for 30 dollars, and after made a wish, he actually found himself in the Dragon Ball World!

However, his fate was to become the most tragic brother of a Hero in history: Raditz!

Who said that Raditz cannot surpass everyone? One who already has the hair of a Super-Saiyan III should have nothing to fear!

- Description from Novelupdates