Rainbow: Nisha Rokubou no Shichinin

Rainbow is a powerful, gritty drama set in 1955 Japan, following seven teenagers who are sent to a reformatory school. The series depicts the brutal reality of life in the facility and the unbreakable bonds of friendship that form between the boys. It is an intense, emotional, and often painful watch, but it is also deeply rewarding. The character development is exceptional, and the story is a testament to the resilience of the human spirit.

It is a must-watch for fans of mature, character-driven dramas who aren't afraid of dark subject matter.