Kyu Saijo (西城 究 Saijō Kyū),[b] a pseudonym for Kenta Imai (今井 健太 Imai Kenta), is the Special Investigations Division's visiting network engineer. He is the resident expert on electronics networks and often performs the information gathering for the group. He seems to be a little too interested in the occult and other topics the Special Investigations Division covers, which everyone seems to notice. After the division is disbanded, Kyu becomes a popular network researcher and author. His novel Mechanical Friendship (機械じかけの友情 Kikai-jikake no Yūjō) becomes a best seller.
Kyu Saijo is portrayed by Kenta Hamano (浜野 謙太 Hamano Kenta).