Sayu Amamiya

Sayu Amamiya is the girl who lives next door to Kei Amane, the two sharing a closeness that rivals that of biological sisters. Despite being an elementary school student, she carries a level of composure and pragmatism far beyond her age, frequently delivering blunt, on-point observations about the adults around her. In everyday life, she serves as a caretaker figure whom Kei relies upon, and is often used by Kei as a cover to conceal her otaku interests from others. Having already seen through the hobbies and romantic entanglements of the main cast, she plays an indispensable role as both the group's straight-talking commentator and a key source of support.