Summary
Sui serves as Kei’s younger sibling and bears a striking resemblance to a youthful version of his brother. At first, he harbors a strong aversion toward Kei, viewing his cohabitation as repulsive and dismissing Kei as nothing more than a robot disguised in human skin. Driven by a deep sense of inferiority regarding Kei’s perfection, Sui convinces himself he cannot match his brother’s standards and consequently neglects his academics. However, witnessing Kei’s capacity for desperation and genuine care causes Sui to develop a profound brother complex. In his interactions with Hikari, he frequently refers to her as "Stupid Girl," yet he remains close by to assist whenever he perceives that Kei requires support. He is a student in Grade 6, Class B at the elementary division of Hakusenkan.
