The name of this pattern reflects its asymmetric design, with the back being longer than the front. This is difficult to see from the photo but clear in the schematic.
Both English and Japanese versions are fully charted using standard knitting and/or crochet symbols. 日本語版はこちらです。.
Japanese size 6 & 8 straight knitting needles (3.9 & 4.5mm)
Japanese size 6 double-pointed knitting needles (3.9mm)