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I recommend BitFlyer for BTC/JPY pairs. They also have BTC/ETH and BTC/BCH pairs as well as market selling LTC, MONA, ETC and LSK.

Coin Marketplace

STEEM 0.18
TRX 0.14
JST 0.030
BTC 58559.96
ETH 3156.41
USDT 1.00
SBD 2.44