Twin girls
A car accident pulls the protagonist into the boundary between life and death - the place of death. People after death wander here and cannot leave. They can only leave after completing a task called "Safely Spend Seven Weeks".
The book's character codenames are taken from the names of the Major Arcana cards in the tarot deck.
Any conflict between the settings and stories in this book and other works is purely coincidental.
Please watch rationally.
Concept: Views on life