Eikō, a student in Class 6-2, thrives as a central figure in the class's mischief, orchestrating playful antics alongside fellow prankster Tomoya. Known for his lighthearted teasing of female classmates, he fuels classroom humor by co-creating popularity rankings that invariably crown Cocoa as the top peer. His mischievous repertoire includes compiling and distributing "golden thoughts"—quirky, memorable quotes from classmate Yuuto—which ripple through daily interactions. Collaborative schemes with Tomoya spark recurring moments of laughter or light friction, cementing his role as an agent of spirited, harmless chaos within the group.