The story is set in a 'smart city' envisioned by Kyocera, where people express themselves through hashtags on overhead displays.
Yoshitoki has designed the original characters, and at first glance, you can see his style throughout the video. The female lead, Yume, closely resembles Shouko Nishimiya from A Silent Voice.
Unlike Nishimiya, however, Yume lacks confidence and she constantly worries that her hashtag won't stand out. To overcome this, she comes up with a special hashtag known as a 'weird tag'.