Hanamaru Udon is a Japanese restaurant brand specializing in Sanuki-style udon, offering a casual way to enjoy noodles inspired by the traditions of Kagawa. Its restaurants use a self-service ordering style similar to that found in Sanuki, with guidance available to help first-time customers place an order. The brand says its noodles are made using a traditional method and simple ingredients: wheat flour, salt, and water. It also highlights care in selecting the flour, noodles, water, broth, and condiments.

The menu includes seasonal limited-time udon, kake udon served with plenty of broth, bukkake udon with a stronger-flavored sauce, and a variety of other noodle dishes. Customers can also choose rice dishes, tempura, oden, and other accompaniments. Takeout and delivery are available at participating locations, and customers can search for restaurants by area or current location. Hanamaru shares promotions and menu updates, including offers through its official app, and presents “udon journeys” focused on eating, learning about, and making udon.