The Apocalypse is Coming: My Scumbag Ex's Hidden Dimension

This book is realistic, with no gore or violence!

The story takes place before a natural disaster. The female protagonist's ex-husband, who has been missing for ten years, suddenly contacts her and gives her a ring. The female protagonist learns that the ring has a space and uses it to hoard supplies.

After a natural disaster, the female protagonist uses the supplies she has stockpiled to take her son and mother along, enjoying delicious food, fighting spies, battling viruses, and surviving earthquakes...

Finally, they pulled off a comeback...