In this adaptation of a manga by Fumi Shibama, itself a retelling of a 1972 manga by Kazuo Kamimura (the original Age of Cohabitation whose existence is implied by the "new" in this title), Honda has been living with Eri for two years and debates whether or not he should ask her to marry him.

1887, at a remote, elite boarding school in France: Serge Battour returns after his graduation, and remembers the days of his youth... 1880, at the same school: Son of a viscount and a Roma prostitute (both deceased), Serge is intelligent, sweet, talented, and alienated by his family due to his heritage. Upon being sent to his new school, he rooms with Gilbert Cocteau, a gorgeous loner of a boy who sells his body for reasons unknown. Serge's attempts to reach out to Gilbert fail spectacularly, and yet there is something in both of them that attracts them to each other.

From the TV series of "Astro Boy," three episodes were selected for theater re-edition, "Robot Rocket" (46th episode), "Earth Defense Troops" (56th episode) and "The Last Day of Earth" (71st episode). Of these three, "Earth Defense Troops" was the only one originally derived from Tezuka Osamu's story "Number 7." Its settings were diverted to the "Astro Boy" series. In this film, the whole scene of "Earth Defense Troops" and a part of "The Last Day of Earth" were reproduced in color for this theater version.

On her way home from school, Yukari Hayasaka is approached by a weird-looking guy who starts looking at her body intently. He's got blond spiky hair, a spiked choker, and multiple piercings on his ears and face. She wants nothing to do with him, and runs away, only to bump into a very tall and beautiful purple-haired woman with a flower pattern around her eye. Yukari faints from shock and wakes up later in a strange place called the Atelier. It turns out that these strangers are fashion designers who attend the most famous art school around, Yazawa Art Academy, and their group wants Yukari to model for their brand in Yazawa Academy's upcoming show. Yukari turns down their offer and escapes the Atelier, but unknowingly leaves her school ID behind. George Koizumi, the head designer, later sees it and immediately knows she would be the perfect model for them and will not stop until he gets what he wants—and he wants her. Yukari had never considered something as frivolous as modeling before, but could life among these eccentric designers actually prove to be fun? Or will Yukari lose herself in this world of art and passion?