Prison Within a Cage

Norther, a race in the bubble world, is harmonious and peaceful, and could have slowly farmed. However, the bubble will eventually burst one day, and when everyone reacts, they have arrived in another world (the whole family has traveled correctly). The problem now faced is: What should I do with the household registration book? This book is also called "I Can't Die Carrying the Hope of the Whole Clan" "Good news, I got promoted, bad news, I'm the only one left in the family"