17岁的高中生秀一，有一个单亲妈妈友子，和妹妹遥香一起生活，原本幸福美满的家庭生活，被友子已离婚的继父曾根打破这份平静，他的到来使秀一一家陷入无尽的痛苦，曾根沉迷喝酒，且有暴力倾向，但母亲叮嘱秀一一定要忍耐，而秀一却找上律师帮助，不过也未能摆脱困境，可是曾根变本加厉，依旧对妹妹和母亲实施暴力，把秀一逼到极点忍无可忍，这也让秀一对曾根顿起杀心，他通过地下渠道得知一种药物可以使人像醉酒昏迷，又偶然发现可以让人电流致死的方法，随即策划一场天衣无缝的谋杀，美术课上他悄悄逃课溜走，并镇定地执行着他的计划，还利用同学给他制造了不在场证据，可是被负责这起案件的警官山本怀疑，可是因为没有证据，且验尸报告显示曾根自然死亡，为此秀一以为一家人又可以回到平静生活感到高兴，但是殊不知他的这一切秘密还是被朋友拓也发现了，并以此威胁索要钱财，秀一被逼无奈，不得已再次犯罪，在这条道路上，他却越陷越深…

Showichi, a 17-year-old high school student, has a single mother, Tomoko, who lives with her younger sister Haruka. The originally happy family life is divorced by Tomoko. His stepfather Sone broke the peace. His arrival caused Xiuyi's family to fall into endless pain. Zeng was addicted to drinking and had violent tendencies, but his mother told Xiuyi to be patient, and Xiuyi sought help from a lawyer, but he couldn't get out of the predicament. But Zeng Gen intensified, still committing violence against his sister and mother, pushing Xiuyi to the extreme, which also made Xiu Yi feel murderous towards Zeng Gen. He learned through underground channels that a drug can make people drunk and unconscious, and accidentally discovered that it can make people feel drunk. The method of electrocution to death, and then planned a seamless murder. In the art class, he quietly skipped class and slipped away, and calmly carried out his plan. He also used his classmates to create an alibi for him, but the person in charge of the case Police officer Yamamoto suspects, but because there is no evidence, and the autopsy report shows that Sone died naturally, so Xiuyi thought that the family could return to a peaceful life, but he didn't know that all his secrets were discovered by his friend Takuya, and threatened him with this. Asking for money, Xiuyi was forced to commit a crime again, but on this road, he got deeper and deeper..