Naruto System in One Piece - Chapter 436

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

Li Jing passed through, into a modern world where all the people cultivated immortals.

Everything here has to rely on the aura of self-cultivation to motivate.

With no relatives, no money in his pocket, and no understanding of how to practice, life is struggling.

Until Li Jing walked into a chicken shop and found that he could see the blood bars of the chickens…

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- Description from novelbuddy

A 29 year old civil employment exam student wakes up in a blank white room and meets a baby angel. This baby angel informs him that he died in his sleep due to heart disease like his father and grandfather. Remembering his mom and their last conversation he says that he will take on a series of life and death tests that the baby angel offers him. From this point on he must put his life on the line and fight in the stage called ‘Arena’. And Every time he clears a test he will gain abilities and weapons to increase his strength. All to clear the tests and get his life back. This is his story of his fights in the ‘Arena’.

This world has Fox Fairies, River Gods, Water Monsters, Great Demons and Cultivators who seek immortality.