Kanazawa is a cartographer (map maker) Chito and Yuuri encountered during their tour. They encountered him as he was blowing a building up so that it would become a bridge over a gorge between two building blocks, but unbeknownst to him, the building almost fell on Chito and Yuuri. Although he left a poor first impression, they soon agreed to help each other, as Chito and Yuuri were also looking for a way to get to the other side, while his bike had broken down. He carries a camera and a pair goggles that can connect to his camera to serve as a screen, so he doesn't have to align his head with the camera.
After they reached the tower and ascended to a higher level, he parted ways with the main cast.
Making maps is the purpose of his life, and he was very careful with his maps. When his bag of maps fell off a malfunctioning elevator, he jumped out in a futile attempt to grab the bag. Chito and Yuuri managed to pull him back, but he told them to let him fall with the bag. Yuuri tried to cheer him up, and gave him a bar of fruit flavored ration, and in return, Kanazawa gave them his camera. He is currently making a new map for the North.
Later, when Chito and Yuuri manage to get into the submarine, they connect the camera that Kanazawa gifted them to the central computer and are able to display the photos contained in it. Apart from the photos the two girls took, they see Kanazawa's photos and lots of other pictures and videos. In particular, there are some photos in which both Kanazawa and an unknown girl are present, who they didn't meet when they encountered Kanazawa. A video is shown of Kanazawa, a girl who appears to be his wife, and a baby. This baby is assumed to be his. Their baby died some time during the apocalypse and his wife died after the events. It is unknown how.