我的妻子的姐姐

出生于继承“黄金骑士GARO”称号的魔戒骑士家族的冴岛大河，继承了黄金铠甲，终日与魔兽霍拉战斗着。某天他接到指令，要求夺回被霍拉·蛇道夺走的魔导具“罗盘”。罗盘中封存着守护人类，掌管着人界的安宁的青龙、朱雀、玄武、白虎的四圣兽之魂。大河与侍奉圣兽祠堂的魔戒导师·吹奇一同挺身而出，誓要夺回罗盘......

　　Joseph Fulton, a well-regarded fifty-eight-year-old director of romantic comedies, wants to become assistant groundskeeper at a local cemetery. He wants to work outdoors and be close to nature. Meanwhile, he thinks it’s important to have his last will and testament drawn up. But his highly dramatic actress girlfriend thinks he must be dying and that he is just too brave to tell anyone. The rumor spreads and soon everyone he knows—and some he doesn’t—are crowded into his small apartment to say their last farewells.

　　Attempting to surpass his father's legacy, a reclusive neuroscientist becomes entangled in his own experiment, pitting ten fragments of his consciousness against each other.

　　故事设定在《废头》世界的1042年前，以机器人“罗宾”作为主角。罗宾原本作为护卫，随同调查队长特里斯前往地下世界调查异常情况。尽管肩负保护特里斯的使命，但调查队却遭到了人工生命体马里甘的邪教组织“吉拉教”的袭击。在压倒性的战力差距下，调查队陷入苦战。然而，在这场激烈的交锋中，他们发现了次元的扭曲，并逐步揭开地下世界隐藏的秘密与异变的真相。