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.
I took her in and raised her while 
protecting her from the enemy.
تبنّيتُها وربّيتها أثناء حمايتها من العدوّ
Ich habe sie aufgenommen,
aufgezogen und vorm Feind beschützt.
La acogí y crié mientras
la protegía del enemigo.
La acogí y crié mientras
la protegía del enemigo.
J’ai décidé de l’adopter
pour l’élever
L'ho adottata e cresciuta
proteggendola dal nemico.
Eu a peguei para criar enquanto 
a protegia do inimigo.
Я забрал её себе и воспитывал, попутно 
стараясь защитить девочку от врагов.