If it is a TWEWY spin-off with consequences for the KH series I could see the entire game taking place in Shibuya.
But if it is a KH title proper, I would like Shibuya to be the hub-world through which characters can 'dive' into other alternate realities (maybe through digital billboard advertisements?). A reality-jumping system would be a great way to incorporate overlapping/contradictory Disney properties that otherwise couldn't exist in the KH universe -- like 'Maleficent' or Tim Burton's 'Alice in Wonderland.'
But if it is a KH title proper, I would like Shibuya to be the hub-world through which characters can 'dive' into other alternate realities (maybe through digital billboard advertisements?). A reality-jumping system would be a great way to incorporate overlapping/contradictory Disney properties that otherwise couldn't exist in the KH universe -- like 'Maleficent' or Tim Burton's 'Alice in Wonderland.'