19世纪末的巴黎，在被玻璃屋檐覆盖的、落后于时代潮流的“国王的长廊”出现了一个叫汤音的日本少女的身影。早上，汤音吃上了奥斯卡先生准备的法式早餐。汤音对法国早餐感到新奇，打扫完卫生后，汤音开始观看克洛德打铁。克洛德带着汤音参观长廊。

Yune eats her first French breakfast and attempts to hide her dislike of cheese! Claude, Oscar's grandson, takes Yune shopping.

Claude becomes inspired by Yune with an idea for a sign for a nearby music shop. Later, they find the owners of Yune's kimono.

Alice, the youngest of the upper-class Blanche family, becomes interested in Yune and wants her to stay with her, but Yune has made a promise to the Claudels.

Claude scolds Yune for her kindness, which is taken advantage of by a boy who steals from the shop.

Alice pays a visit to Yune at Oscar's shop and invites her over for a photograph. There, Yune learns of a past between Alice's sister Camille and Claude

Yune faints from a fever, which fills Claude with guilt for scolding her earlier. He receives help from Alice and her doctor to cure Yune.

A tea party at the Blanche's brings Claude and Camille together, while Alice shows Yune the nursery where she grew up.

Claude speaks about the past with Camille when they used to play together in the Blanche's family garden.

Oscar spends time with Yune and Alice. He shows off a slide projector that reminds Alice of her parts of her life back in Japan.

Alice invites Yune to an exhibition at the Grand Magasin, but Claude opposes and makes other plans for them. Yune shares more about her family in Japan.

Yune goes out to search for a lost black cat and gets lost, which worries Claude who cannot find her.