The videos featured in the concept of the app | What do you be with an important person? Recently, we often see promotion video for app on web site. Promotion video is good method to convey app images of usage and concept with stories. Today, we introduce an excellent app promotion video “Duet”. The app can tell what do you want with someone who you like. Actually, the movie never show app screen. Two people such as friends and lovers just show up one after another on it. But movie tell us abut happy feeling as concept of “Do things with people you love”. [useful tool] Clearly summarize the change in illustrating the change of the number Color scheme of the [useful tools] Web site. Also learning the color scheme