High school students and pro-level gamers Riku Suigin and Riku Rei are about to get swept up in an RPG unlike any other they've played before.

High school student and gamer Suigin Riku attends the prestigious Shinryou Private Academy, a school for the elite and the children of the wealthy. But rich or wealthy are not words that describe Suigin; in fact, he is dirt poor and must work many part time jobs to pay for his tuition. During one such job, he dives into a pool to save his pet cat, fully aware that he cannot swim. Luckily, he is saved by Rei Riku, the beautiful and popular daughter of a game developer, and he falls in love with her. He is also drawn to another girl: a new friend he meets in Dungeon Century, his favorite online RPG. But when the game is scheduled to shut down, he knows his adventures with her will soon end. However, the day after the game is shut down, he finds out that Rei and the online girl are one and the same. Soon after, Rei gives Suigin a new game meant to replace Dungeon Century-a tomb raiding game called Grave Buster. But when Rei is suddenly kidnapped, Suigin is pulled inside Grave Buster to save her. Gin no Guardian follows Suigin as he plays through Grave Buster to save Rei, while uncovering the secrets hidden within the game.—MAL Rewrite

The protagonist, Riku Suigin is a pro-level gamer. The heroine, Riku Rei, knows of this and is the most beautiful girl in school and also loves video games. Suigin receives a device to play a net game called "Grave Buster" from Rei, but Rei is suddenly kidnapped. When Rei puts his hand on the device, he's sucked into the world of the game. And in that world, a battle between the tomb raiders and tomb protectors for the tomb of the mother goddess Bango's tomb has been going on for 1000 years.—Crunchyroll

Lu Shuiyin was a poor high school student who also happened to be a game guru. One day, he turned out to be the heir to a legacy worth 500 million, but the legacy was merely game coins. While still in his puzzled state, a girl he loved was kidnapped, and a series of mysterious events took place afterwards. In the end, he found himself dragged into a game of "tomb robbers", and his mission was to engage in a long-lasting battle as "the last tomb keeper".—WebNovel

Lu Shuiyin (Riku Suigin in Japanese) is a master of gaming, a skill only known to his classmate Lu Lian (Riku Lin in Japanese). One day, Shuiyin receives a device from Lu Lian for a tomb raiding online game. While Shuiyin is excited to receive the device, Lian is suddenly kidnapped. Shuiyin touches the device that was left behind, pulling him inside the game and trapping him there. What is the imaginary world inside the device? What will Shuiyin find there? It is a world where two groups of people fight over the power of the gods, which originates from the tomb the mother goddess Pangu (Bango in Japanese). The two groups are the tomb raiders and the tomb protectors. The device Shuiyin received from Lian is called the Monolith, and it allows a normal gamer to go near the tomb. The tomb raiding group plans its attack by recruiting common people in the name of gaming. Shuiyin, as the final tomb protector, must fight against the raiders in order to save Lian.—Animanga Wiki