Naruto: Systematic Shinobi - Chapter 30: Waterfall 9

Merged into the body of External Disciple Chen Yu was the heart of a demonic god.The heart is the core of life, the most fragile vital organ. To Chen Yu, however, the heart was his greatest strength, granting him power and potential beyond demonic and divine beasts. Here on out, we follow him as he embarks on a mysterious and wonderful journey.

A war veteran and an anime fan as well, he got into anime by watching it with his grandson after his retirement, his grandson loved pokemon and so did he also came to like this world of pokemon where people didn't kill each other and people used to have fun with there pokemon, after watching Pokemon with his grandson and playing with him all day he got back his childhood which he could never experience due to the cruel war, and as of now our MC has turned 82 years old he was very satisfied with his life with no regrets and waiting for death to take him away but will death be is end or will it start a new beginning, a new legend.

Chen Miao transmigrated to a supernatural world, where everyone had their own profession, such as “Student”, “Fighter”, “Thief”, and so on.After much contemplation, he activated the “Gunslinger” profession.From then on!While the foreign races brandished their claws to invade, and others tirelessly trained their physical fitness and learned skills.Chen Miao silently ventured into secret realms to collect all sorts of materials, crafting Occupation Exclusive weapons like the “Thompson Submachine Gun,” “Falling Blossom Sniper Rifle,” “Inferno Gatling,” “Matrix Sky-Eye Cannon,” and so on....One day, people suddenly noticed that a very unfamiliar Supernatural Occupation had appeared on the city's Combat Power rankings.And in the crowd.Chen Miao, bare-chested under a black suit jacket with sunglasses on and a cigar in his mouth, held two Inferno Gatlings in his hands, looking up slightly at a group of scoundrels in front of him with the corners of his mouth turned up.“Don't wait for me to stuff the gun barrel in your mouth before you admit you were wrong.”

Fanatic virtual gamers:
Tired of the stereotyped linear drama emotions? Want to try a real open world game?
Are you tired of playing an RPG that can only play a role? Want to lead the subordinates in virtual reality and experience the thrill of governing the army?
Welcome to the massive open killing game “War in Heaven”.
……
Seeing the game’s winning and losing judgment mechanism, a professional player who is interested in PVP for 20 years and is also very interested in AI, has a bright smile:
“It’s time to show the real killing method… How about building an AI army by the way?”

- Description from Uukanshu translation