Yusuke Nogi of Ryosho's Energy Development Division said that 10 times the official down payment was mistakenly sent to GFL, a local infrastructure company involved in a solar energy plant to be built in the Balkan Republic in Central Asia. Suspected of involvement, he heads to the Balkan Republic to collect the difference of $90 million. With the cooperation of his CIA friend Sam, Nogi obtained information that the terrorist al-Zaer had laundered the full amount of the contract money into diamonds and brought it out.

Shizuku Tsukishima is a middle school student in the 3rd grade. She likes to read books. Shizuku meets Seiji Amasawa, who goes to the same class and school as Shizuku.