Spiral: The Bonds of Reasoning is a 15-book series with 15 primary works first released in 2000 with contributions by Kyo Shirodaira.
2000 • 2 Readers • 192 pages • 3.5
2000 • 1 Reader • 3
2001 • 1 Reader • 3
2003 • 1 Reader • 3
2003 • 1 Reader • 3
2003 • 1 Reader • 3
2004 • 1 Reader • 3
2005 • 1 Reader • 3
2006 • 1 Reader • 3