Saga Of Tanya The Evil Vol. 9 (Light Novel)

An atheist businessman has been reincarnated into a young girl during a magic-filled, war-torn era. Under the scrutiny of “Being X,” the deity has assigned him two conditions if he doesn’t want to spend the rest of eternity in hell: die a natural death and believe that “Being X” is God. Now living as Tanya Degurechaff, she enters the military to climb the ranks and avoid the battlefield. Soon, Tanya is known as the ruthless little girl who prioritizes herself and efficiency over the lives of everyone around her.
In Vol. 9, the war continues to intensify with seemingly no way out for Tanya as she is given a new “impossible” mission to search for and destroy the enemy fleet using a submarine that houses a secret weapon created by MAD.
Notice: This book is written in Japanese.