Shougo Rikudo is a retired archaeologist living in Nirai-Kanai. He is Haruka and Megumi Shitow's uncle, and welcomes Ayato into his household. Soft-spoken and wise, he helps to ground the other characters. He is an expert at shogi, the Japanese equivalent of chess, and at Japanese calligraphy (shodo). It is revealed that it was Professor Rikudo and his assistant Shirow Watari who found Maya and Quon at the shrine, and that Maya was raised as Rikudo's adoptive daughter.