A visual novel following Gen, the founder of Ubai, and his recounting of the events leading up to Ubai's creation together with his partners Keiji and Shizune.

One day on a shift together with Gen, Ryousuke suddenly wondered about the origins of Ubai. Upon popping the question to Gen, all Ryousuke got was the usual cold shoulder. However, Gen suddenly found himself feeling nostalgic as he recalled the events leading up to him creating Ubai together with his partners Keiji and Shizune.