Set in Spain, two Japanese people, Tatsumi, a karate fighter, and Kumi, who is being chased by the mafia, meet and confront the mafia together with an old Spanish detective! Why is Kumi being chased?

Chloé returns after partying. Lázaro, on the other hand, begins his day. Both have different lives, they don't even know each other, but they have a common problem. How far does their freedom go? Behind The Door is a social criticism that tries to show the reality of many people who daily suffer the consequences of the lack of freedom in any of its forms.