What is the fine-grained topic of the following text: In addition to historical fundamental analyses, the complete report available to purchase compares Yasunaga with three other companies in this sector in Japan: Metalart Corporation (2018 sales of 30.46 billion Japanese Yen [US$271.98 million] ), Ohashi Technica Inc. (38.97 billion Japanese Yen [US$348.04 million] ), and Tanaka Seimitsu Kogyo Company Limited (38.40 billion Japanese Yen [US$342.94 million] ). Only return the topic.
Comparative financial analysis of Yasunaga and other Japanese companies in the same sector.