Operetta Due
A subsidiary of Operetta
Operetta Due is a video game developer headquartered in Japan, and a subsidiary of Operetta.
The Crimson Flower that Divides: Lunar Coupling
Koezaru ha Akai Hana After Disc: Ayanasu Mirai
Koezaru wa Akai Hana: Taiga ha Mirai wo Tsumugu