Online manipulation and interface deception are pressing, global threats to everyday users of the Internet. At the user interface (UI) level are tricky and coercive interactive elements found in everyday digital products, variably known as “dark patterns,” deceptive designs, and manipulative UI. As a PRESTO・さきがけ fellow, I aimed to untangle the nature of such forms of interface deception in Japan, discover how are they perceived by professionals and the public, and explore how they can be redressed.