Yakuza Girl by Motonaga Misaki and Okuma Yu-Go — Completed

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Senguu Fumihiro is a young boy that made a promise to his dying grandmother to find a good wife for himself. With this intention he enrolls in a prestigious school but on the first day his world turns upside down when all the students begin to kill each other and one of them even turns into a monster. He is saved by a girl named "Akari", sent to protect him by one of the factions that rule the school.

Volume 1
Chapter 0: Preview released Sep 7 '08
Chapter 1: Getting Acquainted with Diahon Academy released Sep 7 '08
Chapter 2: Escape released Sep 23 '08
Chapter 3: Shikigei released Sep 28 '08
Chapter 4: Attack released Oct 2 '08
Chapter 5: Reason released Oct 14 '08
Volume 2
Chapter 6: Wife released Nov 11 '08
Chapter 7: Future released Nov 13 '08
Chapter 8: The Law of Cause and Effect released Nov 29 '08
Chapter 9: Fabrication released Jan 7 '09
Chapter 10: World released Jan 31 '09
Chapter 11: Wife released Mar 1 '09