Black Raison d'être

Black Raison d'être is a Japanese anison vocal unit linked to Chuunibyou demo Koi ga Shitai! and built around the series' cast-driven character songs. The group is composed of 凸守早苗, 丹生谷森夏, 小鳥遊六花, and 五月七日くみん, and is associated with voice actors from the franchise, including Maaya Uchida. Within Chuunibyou demo Koi ga Shitai!, it performed the ending themes "INSIDE IDENTITY" and "Van!shment Th!s World". Rather than a conventional rock or pop band, the project operates as a seiyuu-driven anison act, and its work forms part of Maaya Uchida's anime-related catalogue alongside her character songs and other anison performances.