川口俊和 has written at least 1 book. Their most popular book is やさしさを忘れぬうちに with 6 saves with an average rating of -⭐.
Series
2 primary booksBefore the Coffee Gets Cold is a 2-book series with 2 primary works first released in 2015 with contributions by Toshikazu Kawaguchi, Maria Helena Sobral, and 川口俊和.