The best replacement for saya is onigen.

The best alternatives to saya are rated as following:
★★★★★  onigen
★★★★★  diva
  diva- blood+

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Speaking about saya, one probably shouldn't forget about haji.

Other search terms related to saya and their ratings are:
★★★★★ haji
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Google Trends

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saya
onigen
diva