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.
We protect the tombs, the power that 
lies within them, and the world...
نحن نحمي الأضرحة، نحمي القوّة الموجودة
...في داخلها، ونحمي العالم
Wir beschützen die Gräber, die Kraft,
die in ihnen schlummert und die Welt …
…las protegemos, al poder
que hay en su interior y al mundo…
…las protegemos, el poder
que hay en su interior y al mundo…
Notre devoir de gardien
est de protéger le monde
Proteggiamo le tombe, il potere
che custodiscono, e il mondo...
Nós protegemos os túmulos, o poder
que está contido neles e o mundo...
Мы защищаем гробницы, 
силу, что сокрыта в них, и весь мир...