>>10420597My interpretation of it is that Kronii somehow lost a watch
Maybe Baelz pulled a Ryuk and threw it into the human world for lols and Watson's relative found it during an investigation, and later passed it down to Amelia.
Amelia was from a doomed timeline (Ina losing control) and it resulted in her jumping far back enough to meet Gura and they jumped back to the present to try to find Ina. Which then attracted the attention of Death because people meant to be dead were not, which also brought Kiara into the picture because she always finds Mori.
Now, the Council appears because they're noticing a human is too powerful and powerful beings aren't behaving as they are supposed to.