Watched the Anime of the series a few years ago but have just finished reading the Manga recently. The story between the two version is quite big a difference and cannot help talking something about. The series was created by Akinobu Uraka (有楽 彰展). The first thing to talk about is the female protagonist. It’s really difficult to define who the heroine is. According to the whole story, Ruri (ルリ) will definitely be the heroine. She is the one who Rumina (留美奈) fell in love with in the first place of the story. But according to my understanding, Rumina only think Ruri is cute since the story doesn’t focus too much on this part which turns out to be difficult in convincing readers about the reason that Rumina and Chelsea (チェルシー) go down to the Tokyo Underground to rescue Ruri. And my claim is proved to be reasonable as the story develops.