Steel, Explosives, and Spellcasters - Chapter 39 - 25: Close Quarters Combat

The prospective college student Luo Ji, who is enjoying the last summer of the third year of high school, has undergone earth-shaking changes at this moment after accepting the invitation of the game friend and becoming the player of the game of “Civilization Rise”.
This is a war game between the world and the world, and it is a fierce collision between civilization and civilization!
To annex the five continents, sweeping across the three oceans, and see how Luo Ji led his people, in this powerful enemy look around, the battlefield of the heroes to fight for a battle to the most powerful imperial civilization!

- Description from uukanshu translation

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

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates

This is a work of fiction. Names, characters, places and incidents either are products of the author’s imagination or are used fictitiously. Any resemblance to actual events or locales or persons, living or dead, is entirely coincidental.Please note that this work of fiction is not safe for work (NSFW). It contains words, scenes, and phrases not suitable for audiences below 18. Be aware.—All the characters here are 18 and above—SynopsisOkumura Kouhei is in love with Saonji Hina, but she’s as cold as ice and doesn’t let anyone get close—she's like a flower that’s impossible to reach. However, everything changes when Kouhei uncovers a secret about Hina that turns his world upside down.To make matters even more complicated, members of the student council decide to get involved, adding to the chaos swirling around him. And let’s not forget about his neighbor next door, who seems to have her own agenda.What will happen to Kouhei now that he’s stumbled upon something he wasn’t meant to discover as a mere human?

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.