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The poor student, Suigin, spent most of his days working various part-time jobs, and his only skill was video games. Suigin then meets the Madonna of the school, Riku Rei, through an online game. However, since Suigin is playing the game for free, their correspondence is limited. However, they continue to play online together whenever they can, and their bond deepens.

Suigin finds out that his only way of interacting with Riku Rei was about to end. The game, “Dungeon Century,” was about to end all of its services. Suigin ends up in utter shock. However, in the game, Suigin promises Riku Rei to do everything he can to find the flower she is looking for in the game. As “Dungeon Century” is about to come to an end, the same company announces that Riku Rei’s father, Riku Yuuki’s new game, “Grave Buster” will start its services soon.

On the last day of services for “Dungeon Century,” many of the players had gathered online to enjoy some last-minute festivities. Riku Rei waits for Suigin to arrive, but ends up going to find the flower herself because he’s taking so long. Suigin ends up late to meet up with her because of his job, and...

Riku Rei summons Suigin after her father, Riku Yuuki dies, and hands him something that Yuuki apparently left for him. Though he is hesitant, Suigin accepts the item, which happens to be a specialized console to play the new game “Grave Buster.” On the console, Riku Yuuki left Suigin a message and one billion in inheritance and tells him to protect Riku Rei.

Riku Rei is taken by some debt collectors, and Suigin follows them. However, Riku Rei’s captors immediately get away by car. Suigin somehow manages to catch up on a bike, but she is then taken away by a mysterious man who magically disappears.

Suigin is pulled into the world of “Grave Buster” by a woman named Twin Star. Surprisingly, Suigin ends up meeting his grandfather, Riku Yuuki, who should’ve been dead, and he can’t hide his doubts about this whole situation. Then a woman named Shostia performs a ritual that reawakens Suigin’s childhood memories. Before they can enjoy their reunion, they are attacked by someone...

Riku Yuuki explains the game of Grave Buster to Suigin. In the game of tomb raiding and tomb guarding that has gone on for years, Riku Yuuki ended up being the one and final guardian to guard the Goddess’s tomb. Suigin finds out that guarding the Goddess’s tomb is connected to protecting Riku Rei, as well, and tells Yuuki as he is fading away that he will become the last guardian.

Suigin receives a message from Temujin, the man who kidnapped Riku Rei, who tells him to come to Grave Buster. Suigin starts gathering information and tries to come up with a plan. Money is everything in the lawless world of Grave Buster. Suigin decides that he needs to hurry and save Riku Rei as soon as possible...

Temujin sees something special in Riku Rei, and gets her something special while he’s holding her captive. Meanwhile, A woman that has been single-handedly defeating tomb raiders has become the buzz of the town. That woman was another billion player, just like Suigin, and her name was the Collector.

Riku Rei undergoes a certain ritual and joins Temujin’s group. Meanwhile, Suigin encounters a young boy named Takeshi. Apparently he is travelling to get money to help his ailing friend, Mikan, who’s like his older sister. He ends up crashing a martial arts tournament and accidentally drags Suigin and Twin Star with him.

Suigin takes Takeshi’s place and fights in the tournament. However, he ends up facing a penalty, and ends up having a difficult battle against his enemy. It’s then that Twin Star reveals their true form and powers, and the path to Suigin’s desired destination opens up...

In order to gain more allies, Suigin tries out Grave Buster’s beginner’s course. There, he encounters his classmate Shaa and the world champion of the virtual fighting game tournament, Titan. Their beautiful instructor, Rin, tells them their first assignment is to defeat her...

In order to get Farin to join his team, Suigin faces off with Titan. Meanwhile, the strongest organization in the game led by Dark Tiger, Precious, starts making moves to conquer Stage 0, not realizing there was now a brand new guardian.

After being forced to log out of the game, Sugin gets a phone call from Temujin. He tells Suigin that if he wants to save Riku Rei, he has to go to Stage 0 and find a player named Nishikaze. He tells Farin this and they both set out to save Riku Rei.

Suigin wins the battle against Aslan and they all head to Stage 0’s entrance. It’s there that Suigin discovers the truth about his past as well as Riku Rei’s.

Now that Suigin regained his lost memories, he tries to go to the Totems’ base with Nishikaze. However, a new foe stands in their way.

Nishikaze shows up in front of Suigin and gives him a message from Temujin. The boss of Stage 0, Aslan, finally shows up and steals all of the players’ blood, but it also appears that he’s searching for someone. Suigin appears, and Aslan finds who he’s looking for.