The following are some of the jeKai entries that provide in-depth information on particular topics.
A bilingual taxonomy of life with links to the biological entries in jeKai
A guide to Japanese writing systems
Words and phrases that often trip up learners of Japanese
A general account of the main types of respect language in Japanese
A guide to slang words formed by inverting the syllables of conventional words
A discussion of words that have been banned as discriminatory
A Slightly Askew Glossary of Japanese Baseball Terms
A comprehensive--and sometimes opinionated--account of terms used in Japanese baseball.