en Cuevana 3. A timid office worker, Hatsuo, was forced to marry the president's only daughter, Akemi, and led a narrow life. His colleague, Takamine no Hana, Shizuka, was his daily comfort, but he couldn't even talk to Roku... Hatsuo, who wanders the streets at night to escape from the painful reality, turns into an invisible man as a result of wanting to drink the medicine he got by chance!