Rainbow Nisha Rokubou no Shichinin    

RAINBOW 二舎六房の七人

Around 10 years after World War II, a group of delinquents are sent to the Shounan Special Reform School to learn how to cope with the atrocities and unfairness they encounter there. A student who has already been residing there when the teens arrived acts as a mentor, teaching them about friendship and guiding them through difficulties.