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OCLC WorldCat is the world's largest network of library content and services with bibliographic records created by OCLC member institutions from all over the world. Waseda University and Keio Universty are OCLC members. It also includes holding information of the National Diet Library.
You can search WorldCat in Japanese lanaguge. You do not have to worry about Chinese character variants when searching WorldCat in Japanese. Click on 日本語 at the top of the screen or bottom of the search screen to enable the Japanese data display.
WebcatPlus provides the bibliographic information to the publications from Edo to the present. Includes information from Japanese research libraries, the National Diet Libraries, and other services including Aozora Bunko, books.or.jp, Wikipedia, etc.
Two search modes are available: 一致検索 and 連想検索.
WebcatPlus now offers links to digitized materials in NDL's Digital Libray from Meiji Era.
This union catalog consists of bibliographic databases of the National Diet Library, some prefectural libraries, and some public libraries in government-designated cities. Check S
国会図書館 近代デジタル・ライブラリー http://kindai.ndl.go.jp/ The NDL is digitizing their older publications after Meiji period. Some are accessible online and others are only accessible within the NDL and other affiliated libraries. However, the bibliographic information for the latter group usually includes the table of contents. The information is quite useful for your document delivery requests.