Petit Rabbit's is a Japanese music group formed specifically for the anime franchise Is the order a rabbit? (Gochuumon wa Usagi Desu ka?). The group serves as a musical unit representing the five main characters of the series, functioning as both performers of theme songs and as a voice actor unit that brings the characters to life through music. The members consist of the voice actors for the core cast:佐仓绫音 as保登心爱, 水濑祈 as香风智乃, 种田梨沙 as天天座理世, 佐藤聪美 as宇治松千夜, and 内田真礼 as桐间纱路.

The musical identity of Petit Rabbit's is inextricably linked to the warm, gentle, and whimsical atmosphere of the Is the order a rabbit? anime. Their songs typically feature bright, uptempo pop arrangements with lyrics that explore themes of friendship, daily happiness, and the simple joys of life at the Rabbit House café. A defining characteristic of their discography is the pattern in which the group's opening theme single for each television season includes a B-side song that is subsequently used as the ending theme for the season's final episode. This pattern is established with their earliest releases and continues throughout their work.

For the first anime season in 2014, Petit Rabbit's made their debut with the opening theme Daydream café, released as a single on May 28, 2014 through NBCUniversal Entertainment Japan. The song features lyrics by 畑亚贵 and composition and arrangement by 大久保薰. The B-side track, 日常デコレーション, written by うらん with composition by 大隅知宇 and arrangement by 大久保薰, served as the ending theme for the first season's twelfth and final episode.

For the second season, Is the order a rabbit??, the group performed the opening theme ノーポイッ! with lyrics by 畑亚贵 and composition and arrangement by 大久保薰. The corresponding B-side and final episode ending theme was なんとなくミライ, which features lyrics by 畑亚贵 with composition and arrangement by ツキダタダシ. This song is specifically noted in the user query as an example of the artist's work.

For the third season, Is the order a rabbit? BLOOM, the group released the single 天空カフェテリア on October 28, 2020. The title track serves as the opening theme, with lyrics by 畑亚贵 and composition and arrangement by 大久保薰. The B-side track, ユメ<ウツツ→ハッピータイム, written by 畑亚贵 with composition and arrangement by 木村有希, was used as the ending theme for the final episode of the season, directly matching the second example provided in the user query.

Beyond the television series, Petit Rabbit's has contributed music to the franchise's original video animations and films. For the film Dear My Sister, the group performed the opening theme ハピネスアンコール with lyrics by 畑亚贵, composition by 木村有希, and arrangement by 川田瑠夏, as well as the theme song セカイがカフェになっちゃった!. For the Sing For You OVA, the group recorded しんがーそんぐぱやぽやメロディー. The group has also released numerous character songs and album tracks throughout the franchise's run, including songs such as 一匙のお姫さま物語, 宝箱のジェットコースター, and にっこりカフェの魔法使い.

The consistent creative team behind Petit Rabbit's is notable. Lyricist 畑亚贵 has written the words for nearly all of the group's major theme songs and character pieces, providing a cohesive lyrical voice that unites the project's extensive musical catalog. Composers such as 大久保薰, 木村有希, and ツキダタダシ have contributed regularly, shaping the group's signature sound. The group releases their music through NBCUniversal Entertainment Japan, which has distributed all of their singles and albums.

Within the anime music industry, Petit Rabbit's represents a successful model of a character-linked voice actor unit that maintains a consistent musical identity across multiple seasons and related media projects. The group's longevity, spanning from 2014 through the 2020 release of BLOOM and beyond, demonstrates the sustained popularity of the Is the order a rabbit? franchise and the integral role its music plays in the overall brand. The group's work is characterized by warm, accessible J-pop arrangements and lyrics that directly reflect the gentle, optimistic worldview of the source material, making them a significant contributor to the musical landscape of slice-of-life anime.