Start in DxD as Motohama: Leveling Up in Another World - Chapter 1: Awaken the memories. Secret room? Door to another world!

In the real world, martial arts have resurged. Chen Sheng, tired of city life, returned to his hometown and awakened an attribute panel, along with a skill.

[Body of Breakthrough: Through training, your physical qualities have limitless growth, and the training effect will not diminish.]

One year later, Chen Sheng held his breath and focused his energy, lightly striking his fist towards the mountain in front of him. In an instant, the mountain crumbled and the earth split. The mountain disintegrated instantly.

“Did you see that?”

“That's the Crumbling Fist of Thousand Move Fists.”

“Once you reach this level, you can be considered an entry-level practitioner.”

The disciples were dumbfounded.

……………………………………………………………

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After being struck by a crazed driver, Eden found himself reincarnated into another world as the last heir of one of the three most powerful clans.Immediately after birth, he was declared a powerful god known as 'Doom'. However, he soon realized that he had been reborn into a world from a novel he had never read, only seen advertised.In this world, evil souls and exorcists existed in secret, hidden from the citizens who lived in ignorance of their presence. Exorcists were born to rid the world of evil souls, maintaining the balance of the world.Eden was born with the power of Doom, and his eyes were meant to be covered at all costs, for anything they gazed upon would meet its demise.Determined to control his power, Eden struggled but failed. Everything changed when the inevitable finally arrived...[Ding! You have obtained the Doom system]A system that shall create the pact for him to tame his power and successfully defeat the evil souls.[Special ability! Host has the special eyes of doom from birth][Ding! Reversing weak aura into......]Eden was reborn with the most chaotic power and it is only a matter of time before we know what this ability shall cause upon this world.

[You can now choose three of the following seven options
1. Go back to five years ago with the present memory
2. Five centimeters taller
3. Seven million deposits
4. Appearance +50 points
5. A company with a market capitalization of 500 million
6. Proficient in a foreign language
7. Teaser live broadcast 10 million virtual coins]

Li Ang became angry after finishing the selection: choose every day, choose, choose, you will give it after the selection!
…
Fuck, it’s really shipped!

- Description from novelbuddy

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.