Toumei na Tobira.

 (透明なトビラ. ; Transparent Door.) is an idol group that debuted on August 21, 2020. They are a group under Kimiiro Project.

Their catchphrase is "Uncertain Epilogue" (不確かなエピローグ).

Current Members

 * Segawa Nodoka (瀬川のどか)
 * Asahina Matsuri (朝日南まつり)
 * Sato Miki (佐藤みき)

Former Members

 * Fukase Marina (深瀬真璃奈) (Graduated January 16, 2021)
 * Momosuzu Ranze (桃鈴蘭世) (Graduated July 2022)

Digital Singles

 * 1) [2020.07.21] Sabi no Owari wa Totsuzen ni (サビの終わりは突然に)