故事围绕着前作中铁镇转学到福岛后，许下的“两年后回来”的承诺展开。虽然直酱知道这个承诺是谎言，但金边和山町仍然相信并等待。故事描绘了五年级学生的暑假，与两年前的天真烂漫有些不同。
A family attempt to connect with the murderer of their daughter after he's spent 20 years in prison for the crime.
