* '''Common''' is the most common language, spoken by most sapient inhabitants of the Mazes. It is virtually identical to English. In written form, the spellings employed by Common most resemble American English, with a few peculiarities (such as ''alumin'''i'''um'' instead of ''aluminum'').
* '''Youkai-go''' is the second most common language. It is spoken mostly by youkai, though a significant amount of non-youkai sapients have learned to speak it as well, usually for the purpose of integrating better into youkai communities. It is virtually identical to modern Japanese.
* The '''Angelic''' language is a tongue spoken and understood only by Angelic creatures (including [[shrine maiden|shrine maidens]]). It has been described as airy and melodic, and appears to be some type of tonal language. Angelic has a written form, using an alphabet of 34 letters (13 vowels and 21 consonants) as well as a proprietary script. Angelic can theoretically be taught and learned normally, however and according to shrine maidens, Angelic influence seems to instill the ability to understand, speak and write the language fluently.
* The '''Demonic''' language is a tongue spoken and understood only by Demonic creatures (including [[dark maiden|dark maidens]]). It is an atonal language, described as guttural and raspy. Demonic has a written form, using an alphabet of 26 letters (12 vowels and 14 consonants) as well as a proprietary script. Like with Angelic, Demonic can theoretically be taught and learned normally, but creatures under Demonic influence seem to instantly acquire the ability to speak the language fluently.