Wakaba is Kuniharu's wife. Not much is known about their relationship but it appears he loves her as he was quick to place her and Azusa in the care of Hiroshi Inaba when the Don Valentino began stalking them as he was fully aware of her non-existent sense of danger. He even promised his curious wife that he would return to pick them up after work was over, showing his care for her. Kuniharu does not appear to very intimate with her as he did not kiss her (which she requested) like he kissed Azusa as he left to handle work though this was possibly out of embarrassment as Hiroshi and the others were present. When Hiroshi and Kei later asked Azusa what role she wanted in the game "House", she chose the father role and put on necktie like her father. Hiroshi pretended to be the mother, and then Azusa immediately kissed him, which could support the idea that Kuniharu is closer to his wife than is shown since Azusa was almost definitely basing the roles on her family. He also likes to include his wife in fun activities with their daughter, showing he doesn't want her left out.