It's cute... Honestly that is all there is too it. It's cool how some Vocaloids got an anime but I feel like to enjoy it you need to be a Vocaloid fan. Each episode isn't very long so they don't cover much. You can get through the entire series in about a half an hour. Heck even less then that. It's just a cute show that you can feel happy at the end of it. They don't really explain anything like what 757 means (ether that or I forgot what it means) which is not great. I would recommend checking out the songs from theVocaloids. There are some on YouTube and they are very high quality Voice banks.