グレイの国での冒険
Abenteuer im Grauland
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Data from <a href="https://ameqlist.com/0ha/haya/rhodan5.htm">ameqlist.com</a> and the National Diet Library. Number 608 in the series 宇宙英雄ローダン (Uchū hideo Rōdan) -- Space Hero Rhodan. Ameqlist notes the inclusion of an essay by 増田久美子 (Kumiko Masuda, the translator) but doesn't give a title.