Bitcoin Cash (ビットコインキャッシュ) is a split from Bitcoin with a protocol upgrade to fix on-chain capacity. If Bitcoin Cash gets majority of Proof-of-Work then it becomes de facto Bitcoin. It will be a Bitcoin without Segregated Witness (SegWit) as soft fork, where upgrades of the protocol are done mainly through hard forks, without changing the economic rules of the Bitcoin. Bitcoin Cash will be a fork of the Bitcoin blockchain, one-to-one.