Youko and Harumi have been friends since youth as their life circumstances were similar. Youko ends up marrying a politician and publishes a successful picture book basen on Harumi's life, when her son suddenly gets abducted.
After the events of the series, Shibata has lost her memories and is reassigned. Meanwhile, a strange case regarding a cursed tree that kills whoever's name is written on its trunk surfaces among mysterious deaths. Following different leads, Shibata and the Unsolved Cases unit will meet again as...
