The end of Kingdom Hearts 3 shows Sora using the Power of Waking one more time to save Kairi, which results in him being sent to Quadratum for Kingdom Hearts 4. This seems to be the inciting event ...

We are the ones who waited 14 years between Kingdom Hearts II and Kingdom Hearts III, trusting Square ... I was invested in Sora's loyalty to Riku. I wanted to wring Demyx's neck with my bare ...