Orders? No, I'm only offering it as... a suggestion.
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Ryu Books are key items used in the .hack saga which can track certain accomplishments fulfilled by a player, giving them certain bonuses such as movie clips or desktop music.

The World

Ryu Books have an special category in the Key Items menu. There are a total of 8 books; each one that can be unlocked at certain times when using Data Drain skill. Each book is added to the Key Items, and records a specific data like enemies defeated, or number of trades made. When you reach a certain number, the Ryu Book will generate a Picture, Movie or BGM in the ALTIMIT screen.

• Ryu Book I: It shows the number of areas visited and total play time.

• Ryu Book II: It shows the amount of Magic Portals activated in Fields and Dungeons.

• Ryu Book III: It shows the amount of players you have met and trades.

• Ryu Book IV: It shows the amount of monsters you have fought.

• Ryu Book V: It shows the amount of GP in gifts to other players.

• Ryu Book VI: It shows the amount of Gott Statues, treasures, boxes, casks, jars, and bones cleared.

• Ryu Book VII: It shows the amount of Spring of Myst and Symbols activated.

• Ryu Book VIII: It shows the amount of Grunty Food and the Gruntys raised.

The World R:2

During G.U. Ryu Books are a Guild feature, used for increasing Guild Rank.