Itai no wa Iya nanode Bōgyo-Ryoku ni Kyokufuri Shitai to Omoimasu - Chapter 104

Chen Mo a game designer got sent to a parallel world with advance technology but undeveloped game concepts.

APOCALYPSE.What is an apocalypse?Anything that stops or breaks the world's working flow, anything that throws human civilization into disarray, is an apocalypse.It can be a zombie attack or an EMP attack, where electrical appliances and other things stop working. Even a natural disaster at a catastrophic level will result in an apocalypse!This book is the story of one such unique apocalypse.A fantasy apocalypse where a game system descends on Earth, making humans the ones being played.Monsters roam on the earth's surface as humans hide, while gods watch from above.Some of those gods support, while others just enjoy.So, if you want such a book, then hop on your seats and put on your glasses (if you have any), as this is going to be a story of a very unique type of apocalypse (according to me).Join me in the journey of a boy named Alex as he navigates and survives through the apocalypse, along with an AI capable of copying anything.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

Crossing to One Piece world, he became Roger’s younger brother.