Star Girl and the Illusion Paradise (星ノ少女ト幻奏楽土) is a series by Story Researcher (doujin group formed by cosMo and GAiA). CosMo is in charge of the music and illustration, while GAiA collaborated with him in the lyrics.
The story occurs in a strange city known as Stella that grants the wishes of the girls who live there, erasing their sorrowful memories and reality. Though they get what they want, the question is if it will really make them happy, and how long will they try to run away from the truth. While this occurs, a mysterious and obscure character tries to make them all realize the harsh truth, generally with dreadful results, as the inhabitants usually can't cope with it...
In this song, Lost Girl is upset because the boy she was in love with "ran away," so she searches all over an unfamiliar town to look for him. Once she reaches the railroad crossing, however, she remembers the truth: the boy died. She then stands on the train tracks and commits suicide, not wanting to live without him.
修道少女と偶像少女 (Shuudou Shoujo to Guuzou Shoujo / The Nun and Idol Girl)
This song is about a girl who enters the religious life as a nun. She listens to the confessions of the citizens, but really doesn't understand how she got her job, nor does she take it seriously. She is bored with her life and wants to make it exciting, so by the advice of her computer guide, she becomes an internet idol. When her fans begin to turn against her, she threatens to do something about it with a knife - only she begins to remember that she was an internet idol once before, and had been cutting her wrists in response to fan negativity. She returns to the church and is about to cut her wrists, but is stopped by a young priest and accidentally stabs him. Unable to do anything, she vows to return to her life as a nun and continue apologizing to God for her crimes.
We are introduced to Dr. Realist, Rho, and Lambda, the two from ANTI THE∞HOLiC. Dr. Realist is a strange gentleman who hates the people within the city for not facing reality and escaping into the city's illusions. He attempts by any means necessary to make the citizens realize the truth. However, the results generally don't end well as the different candidates can't stand the reality. (Note: this song takes place after Childish Girl, but was posted before its official release)
もう一つの迷子少女 (Mōhitotsu no Maigo Shōjo / Another Lost Girl)
Formerly called "Lost Girl and the Meteor Gentleman," this track is more of a brief dialogue than a song. At the end of Runaway Boy and The Lost Girl, Lost Girl meets Dr. Realist who asks her what's the matter. She replies that she's looking for her boyfriend, but he explains that who she's looking for isn't there and will lead her to what she had lost, before arriving at the railway.
A childish girl who is sick of growing up wishes to forget the adult world and become a carefree child again. The city grants her wish, and after gaining access to the core of the city, she returns to being a child. After a "shooting star" grants her and her friends' wish to have something to play, they begin to use the junk received to build a paradise for the kids. They do this without realizing that they were repeating the system and world of the adults. In the end, while trying to return to her childish world, she ends up jumping into a sewer that was under construction. While in parallel, Rho and Lambda contemplate how the events unfold while commenting about them.
冒険少女と箱庭遊戯 (Bouken Shoujo to Hakoniwa Yuugi / The Adventurous Girl and the Miniature Garden Game)
A girl wakes up in a strange Miniature Garden with a pair of floating dice. She proceeds to play the game with these dice as her guide. However she finds herself struggling to walk, as she hasn't used her legs in a long time. Despite this, she continues on. There's so much to explore and discover, but the dice urge her on to the goal, only to discover at the very end that it is her own bed. Realizing it was just a game, and that she needs to go to sleep, she reluctantly bids the Miniature Garden good night, saying she'll come back tomorrow to play some more.
It is commonly interpreted that the girl had some kind of disease, that in the end killed her.
電波少女と空想庭園 (Denpa Shoujo to Kuusou Teien / The Radio Girl and the Fantastic Garden)
Dwelling within the Fantastic Garden, Denpa Shoujo uses her Magical Pen to fight monsters from the opposing world called Reality. She draws up many comrades to defeat Reality with the power of Fantasy. She faces the Last Boss "Realist" who asks her if she has the motivation to return to Reality, knowing that this world is only a fantasy. She refuses and attacks him with her comrades, defeating him. After the end credits roll, Denpa Shoujo decides to continue protecting this world. Realist chides himself for going along with such a farce.
転生少女と転生少年 (Tensei Shoujo o Tensei Shounen / The Reborn Girl and Reborn Boy)
Watching Lost Girl and her boyfriend from afar is one of Lost Girl's closest friends. The Girl is highly jealous of her friend's boyfriend, and longs to be Lost Girl's lover. Silently hanging on to her affections for years, she is invited into a fantasy world where she becomes a boy, in place of Lost Girl's boyfriend. While it's what she (he?) wanted, he quickly finds it boring. Over time, he gets the feeling that this love-game with Lost Girl will be over soon. After much internal strife, s/he realizes that the Lost Girl in this world is only a fake - the real one exists outside in Reality. Rejecting this fake world, he says goodbye as he crosses a set of train tracks, but before he can turn back to see her, the train passes between them. Brought back to Reality, Reborn Girl can only remain her best friend, wishing for Lost Girl's happiness.
The many daisies in the PV are referencing the tradition of picking flower petals off of a flower and with each one saying "He/She loves me" or "He/She loves me not." Whichever petal is the last one, and whatever saying you are on, it is decided whether the person loves you back or not.
Dr. Realist begins by explaining his past as a scientist, the many other planets that are in a similar situation and asks for Reborn Girl's cooperation in shutting down the Stella system. She accepts, and is given her form as Rho. They travel through the many layers of the fantastic garden, while encountering its many victims along the way. Finally, they find the lonely A.I Girl, the one orchestrating the illusion paradise and rescued her from its darkness. With the Stella system finally destroyed, they invite her to join them. She accepts, and is given her form as Lambda.
浅紫色のエンドロール (Asamurasaki Iro no Endorōru / Light Purple Endroll)
The final song of the series, showing the ending credits and the entire series in fast forward. Dr. Realist, Rho, and Lambda sing a final message to the audience and fly off into the cosmos ready to help another planet.
The majority of the transcript for this song was placed in the beginning of A.I Girl. Dr. Realist asks for Reborn Girl's cooperation in shutting down the Stella system. She accepts, and is given her form as Rho.
This song happens at the train station, after the girl cries, Dr.Realist comes and talks with her.
Dr. Realist's monocled star avatar shows up in a few videos in (and outside of) this series, including:
Θ Capsule in the background to the right of Shii-tan.
The Runaway Boy and Lost Girl, on her second run through the city, the star blocks the hole leading to the inner city, letting her reach the train tracks.
Nun and Idol Girl, as the avatar of Miku's computer guide.
The wishing star in Childish Girl and the Grown-Up World.
On various title screens for certain girls (Nun/Idol Girl, Adventurous Girl).
The Last Boss "Realist" in The Radio Girl and the Fantastic Garden.
One of the original tags for this series was "街＜ステラ＞シリーズ"or "街《ステラ》シリーズ" (<Stella> City Series), but was changed shortly after the upload of Dr. Realist. (Youtube uploads that used this tag can be found here.)
As of the upload of Childish Girl, cosMo changed the tag again from "The Girl's Fantasy Cinema" (少女の幻想劇場) to "Star Girl and the Illusion Paradise" (星ノ少女ト幻奏楽土).
As depicted in novel the flower is Margaret... not "lily" nor "daisy".
In the Delusional World, Denpa is a hikikomori; she never goes to school and never goes outside her bedroom.
According to the novel, this is what happened in reality:
Maigo Shoujo becomes a special person who can travel both the Delusional World and the real world, and became an error where Stella brainwashed her. Dr. Realist guided her to reality (the train station) where they're apart.
Shudou Shoujo continues to plead to be forgiven.
Doushin Shoujo jumps in the manhole and never comes back.
Bouken Shoujo died from a disease.
Denpa Shoujo jumped from her "mansion" which means she might be dead.
Tensei Shoujo watched Maigo die and she became Rho to destroy Stella.
Stella is given a body by Dr. Realist and now continues to save other planets.