The promotional videos for the anime Violet Evergarden consist of two segments, each approximately 40 seconds long. I highly recommend this anime, and as for this additional series, it serves as a great promotional video. MyAnimeList lists it separately for this reason. I suggest watching these before starting the anime; they are very short, so you won't lose anything. The main series consists of 13 episodes, plus one special episode and two movies. Honestly, it is a drama anime that I love very much. Watch this promotion and check out the story; if it catches your interest, you should watch it. (There might be issues with thetranslation as my English is not very good.)