Gekkō Itabashi is a male student with blonde hair and grey eyes. His personality displays "chuuni" traits, featuring a theatrical and eccentric demeanor. He engages with the SCM device, which enforces master-slave relationships through games. Gekkō infiltrates a school alongside Fujiko and Julia during SCM operations. He obtained his SCM from Maria Chiyoda, an online acquaintance. Collaborating with Maria and Zero Shinagawa, he works to escape Ryuuou Edogawa's influence. Zero manifests an alternate personality called Kiyo, who independently uses her own SCM to enslave others. This group operates covertly, indicating prior coordination. Gekkō demonstrates strategic knowledge of SCM mechanics, though his information's source is unspecified. He participates in Julia Katsushika's rescue alongside Ataru Chūō and others, acting without direct orders during her disappearance. Gekkō, Maria, and Zero/Kiyo maintain ongoing collaboration to achieve shared objectives in the SCM conflict.