researchmap is the only Web site that collects and provides scientific information on research institutes, researchers, research projects and research resources in Japan.

KAKEN covers research conducted with grants-in-aid for scientific research provided by Japan's Ministry of Education, Culture, Sports, Science and Technology (MEXT) or the Japan Society for the Promotion of Science (JSPS). It contains records of the data made available at the start of each project (adopted topics), and outlines of the project deliverables (research reports and outlines of deliverables).

Institutional Repositories DataBase (IRDB) is a database that collects and provides metadata of the contents registered in institutional repositories in Japan.

Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations.

In WARP the NDL has selectively collected Internet resources published within Japan, especially resources that are at risk of vanishing.
You can search archived websites in their original version. In addition, a part of core works extracted from the website such as online publications, white papers, yearbooks, etc. are assigned metadata and stored.

CiNii Books provides holiding information of Japanese academic libraries.

This is the digitization of all the study results of Japanese historical place names and local history study (51 volumes/ Heibonsha ) accessable from its WEB site.

The database allows you to search and view all articles from the Nishinippon Shimbun's morning and evening editions (final editions), regional editions for the seven prefectures of Kyushu, and editorial features.
However, the following articles may not be available:

This is the digitization of the largest Japanese History Encyclopedia all 15 volumes (17 books).

Kenkyusha's dictionaries, which are mainly English-Japanese / Japanese-English dictionaries, are searchable online.