The Enemy Captain, Hyrein

Short Summary
''Yūma and Jin fight Viza and Hyuse respectively; Suwa Unit fights Enedra; and Osamu, Karasuma, and the C-Rank trainees are attacked by Rabbits. Yoneya, Midorikawa, and Izumi join them. However, feeling that the mission was getting nowhere, Hairein joins the battle himself, cubifying Chika.''

Adapted From

 * Chapter 66
 * Chapter 67
 * Chapter 68