Collapse Star Tieguanying Second Creation

The protagonist has a weak presence (he disappears later on), and the main and secondary plots are connected to the author's previous book, so it doesn't matter if you haven't read it.

Timeline: Collapse: The time is before the 2.0 main line and after the 1.6 main line

Collapse 3: In the third collapse, the three families were taken to Hyperion and returned to St. Freya Academy