07th Expansion is a Japanese dōjin circle specialized in the creation of visual novels.

They would sell their works at various events including Comiket where they met BT who later became the manager of their homepage.

During this time, Tsukihime by Type Moon rose in popularity opening the door for many aspiring doujin circles including 07th Expansion as co-founder Yatazakura began learning how to use NScripter.

Along with Ryukishi07, they began their attempt at making a visual novel using a scrapped stage play written by Ryukishi07 called Hinamizawa Bus Stop as the main part.

Her 4th outfit eventually become the uniform of Angel Mort, a fictional restaurant in Higurashi When They Cry.