Kingdom Hearts Unchained χ was the name of an iOS and Android smartphone game before it got rebranded to ' Kingdom Hearts Union χ.' You can also watch a full English translated playthrough in the YouTube playlist here. So, in order to experience this title, you can watch all of the story-related cutscenes translated to English in the YouTube playlist here. Kingdom Hearts χ was a Japanese-only browser game that is now discontinued.
Experiencing the whole 'χ' series of titles is way overly complicated, so I'll just copy and paste an explanation I gave to someone previously:
