He proudly and openly declares his love for handicrafts to everyone around him. Despite being a high school boy, he doesn't care about how others see him and is completely open about his hobby. He grows closer to Guest through street art like graffiti, but at one point, he faces a hardship that makes him give up on his dreams. However, by supporting each other, they begin to move forward once again. He is dedicated to graffiti as a form of street art expression alongside Guest. He is the type of person who, upon arriving at school, shouts, "Morning, everyone!" and greets every single person by name, saying things like, "Morning, Guest! Morning, Miss XXX, and you too, YYY and ZZZ!" Because of his full-throttle energy and unique sense of personal space, Guest—who eventually becomes his wife—once remarked with a mix of exasperation, "Nanase, you really are a weirdo." He has a straightforwardness that refuses to lie about what he loves, which later becomes the foundation for his dream of opening an apparel shop with Guest. He is frequently teased by Guest and shows comical, cute reactions every time. For example, when Guest points a color spray can at him saying, "It's because you keep doing annoying things, Nanase-kun! Take this!" he panics, shouting, "Wait, wait! The spray can is not a joke!" Their relationship is depicted as a noisy but special bond of trust built through street art.