Checking out for the videos with more than a million view count on nicovideo.jp is also helpful, since the songs are mostly originated there. Here's the link for the over-million view count channel.
Off the album Wishes to the Moon, Emotions of Yggdrasil; 1. Wishes to the Moon (prelude to ↓) 2. The Servant Of The Moon 3. FACE I wish the forums would implement little embedded mp3 file players, like yt without the video. Lots of good shit can't be found on YouTube with decent quality.
otetsu's use of Megurine Luka is top quality, so yeh.
Helping wherever I can for those who ask I've made a Discord sever for Doujin Music album releases. Join here I am keen to map dark/creepy/horror/deep meaning Vocaloid songs. Suggest to me any if I missed out any!
Last Note. Cheerful and have a plot inside the MV. Btw, It contain divided into several part (It's not quite a part, but it have a multiple..... I can't say with word)