(This book cannot be returned.)
"Skills are more important for life, but they are never essential as a family."
Michael lives in a world divided into seven sections, dedicated to different school grades.
After meeting with Caroline, Michael wants to stay with her. She goes missing.
At the test, Michael discovers that he belongs to all of them - called ITO. As he discovers unrest and growing conflict that threatens to destroy their society, Michael understands he can be the only one who saves them all.