Kidou Senshi Gundam 00: Aoi Kizuna

The World may be United but the time has come for Celestial Being to begin their interventions again.
For all of those who stand up in answer to the call, irreplaceable "Bonds" exist.

Bonds contains five short stories set throughout the second season, including Soma's transformation into Marie, Sumeragi's return to Celestial Being, and Marina creating her song for Kataron.