Topology

 is the 21st single by Ito Kanako.

Tracklist

 * 1) Topology (トポロジー)
 * 2) Kizuna no Kesshou (キズナの結晶)
 * 3) Topology (トポロジー) Anime ver.
 * 4) Topology (トポロジー) off Vocal
 * 5) Kizuna no Kesshou (キズナの結晶) off Vocal