Seven Days War (Anime Movie)

Mamoru Suzuhara is a reserved high school student who enjoys studying modern warfare. He musters up the courage to ask his crush, Aya Chiyono, to run away with him after discovering that she and her family will be leaving the following week. Along with four of their friends, they establish a camp in an abandoned coal factory, unaware that they may not be the only ones there. Bokura no Nanokakan Sensou, based on the titular novel, is a coming-of-age story that follows a rebellion that turns into a war against adults as the youths learn to face their emotions and protect what they cherish.