Celta's Heartmates (2003–2015)
- Heart Thief (2003)
- Heart Duel (2004)
- Heart Choice (2005)
- Heart Quest (2006)
- Heart Dance (2007)
- Heart Fate (2008)
- Heart Journey (2010)
- Heart Search (2011)
- Hearts and Swords (2011)
- Heart Fortune (2013)
- Heart Legacy (2015)