The Water Spirit of Oath
Author(s) Yamaguchi Noboru
Original title 誓約の水精霊
Illustrator Usatsuka Eiji
Country Japan
Language Japanese
Series The Familiar of Zero
Genre(s) Fantasy
Publisher MF Bunko J
Media type Print
Preceded by The Founder's Prayer Book
Followed by A Holiday in Tristania

The Water Spirit of Oath is the fourth volume of the light novel series The Familiar of Zero.

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