The short story novel, "The cat called Mari." No8 by Seiji Ninomiya

The day has come. Susie had to say farewell and gooby to Mari.
Japanese boy Ken said to Susie, "Don't cry Susie. After the war end. You can meet Mari again."
"I hope so." Susie answered Ken.
Susie put  crossneckless to Mari.
"Good luck Mari,. Good luck." She said to mari again and again.
Mari and Ken went back to Kure.
Johnson family went back to U.S. October 1941.
The war began two month later.