“检察官”阿直与“律师”阿圆从学生时期便开始交往，一共交往了7年。两人分手后，会向对方介绍彼此的新恋人，一有事还会见面吐槽对方……这种微妙的关系持续了13年。某天，阿直负责的“未来港连环撞车案”出现了死者，案情因此突然变得十分严重。而原本决定绝不处理刑事案件的阿圆，也成为了本案嫌疑人的辩护律师……曾是情侣的两人，即将以检察官跟律师的身份进行对峙。 　　检察官阿直需要将嫌疑人立案，律师阿圆想让嫌疑人得以释放。两人站在各自的立场上，开始追查案件真相。同时，阿直、阿圆加上两人现在的恋人，这四人非同一般的恋情错综复杂，故事朝着意料之外的方向展开……！

Prosecutor Komazuki Nao from the Yokohama District Public Prosecutors Office’s Minato Mirai branch and lawyer Tsutaya Madoka (Matsu Takako) from the law firm Yokohama Gold dated for seven years since the time they were in school. Even after they broke up, they have continued to be hopelessly linked to each other.