The pattern is written in Japanese. However, since Japanese crochet (and knit!) designers understand that most of the world cannot read the Japanese language, they make liberal use of charts, diagrams, and schematics.
Pages 2 and 3 of the pattern contain the charts, diagrams, and schematics. There's a consistent system of crochet stitch symbols (I remember linking to it last week but can't find it ATM ) used internationally.
Hope some of this helps.