After Ever 9 from Eternal AI defects, the leader Ever 4 is reassigned for advocating robot rights. Confronted with the outwardly rebellious yet inwardly lonely and love-starved young master, Bushi LO, Ever 4’s quirky personality behind his glasses gradually comes to light as their interactions escalate. “Master, don’t ignore my advice, and don’t even think about running away. You’re the only one I answer to in this lifetime. I’ll always have your back, no matter what happens!”
恆極智能自從恆人系列9號叛逃後,身為領導者的4號也因為抗議機器人的權益而被下放。面對表面不羈卻寂寞缺愛的少爺羅布仕,逐漸失控的接觸讓恆4隱藏在眼鏡下的鬼畜性格屢次啟動。「少爺,不要不聽我的話,也不要想逃離,反正這輩子我只認你,就算掛了也會護你周全!」