This pattern is written in Japanese.
It is charted pattern.

Please download basic information on how to read Japanese charted patterns:
http://www.tezukuritown.com/nihonvogue_ravelry/doc/dl_Jap...

Tool: Japanese size 3/0, 4/0 & 5/0 crochet hook (2.3, 2.5 & 3.0mm)

iOS app japanse crochet symblos
http://www.amimonojapan.com/app/crochet