Ritsuko first appears along with Gargantua in episode three, though she plays a greater role in episode four. Set approximately 100 years after episode 3, she is an immortal magic user and appears no older than 25, despite being over a century old. Ritsuko travels the countryside performing healing miracles. She has never forgotten Jill or Gargantua, and carries small portraits of them in her locket. When she comes to the castle to heal Princess Mariel, she is taken in as the court alchemist. One day, while escorting the princess around the village, Ritsuko meets Gargantua, who is also immortal because of Jill's souma and has learned dark magic. He kidnaps Princess Mariel and tries to sacrifice her to Lilith, in order to be shown where Eve is. Ritsuko stops him only too late and is framed for the kidnapping and thrown into a dungeon. Ritsuko is a user of sexual magic in the game, and one of the bodies occupied by the player is under her spell. She is also seen travelling through the books with two children. Her true name, the name she uses as a character in another ero-game, is revealed towards the end of the game. At the end of the anime, thanks to some interference by Eve and Tamamonomae, Gargantua returns for Ritsuko, freeing her from her cell and taking her back with him to his own realm.   

Hatsuki is a highschool student living with her sister, Hatsumi, who she has a huge crush on. On Hatsumi's 16th birthday, she is suddenly surrounded by a green light and disappears in front of Hatsuki. She manages to follow Hatsumi with the help of a being resembling a fat baby chick (literally), ending up in a place called "The Great Library", which is full of different worlds stored in books. Hatsumi wasn't there, though, so the search for Hatsuki's great love begins and involves traveling from book to book.

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.