Barbara Holthus, Matthias Huber and Hiromi Tanaka (Meiji University) have published a data report on the ongoing project Parental Well-being: Japan and Germany in Comparison:
Holthus, Barbara, Matthias Huber and Hiromi Tanaka (2015): Parental Well-Being in Japan. German Institute for Japanese Studies (DIJ). Miscellanea 19. Tokyo and Vienna: German Institute for Japanese Studies (DIJ).