The tenth volume of the Sora no Otoshimono manga was first released on October 26th, 2010 by the Kadokawa Shoten Publishing Corporation. This volume continues and eventually concludes the main involvement of Hiyori Kazane in the Sora no Otoshimono story, but not after the stunning truth about her real identity and purpose is discovered.
Chapter Thirty Seven: Hiyori!!
Chapter Thirty Eight: Forgetfulness
Chapter Thirty Nine: Conflict!!
Chapter Forty: Leaving the Club!!