Takeru, Usagi and Ikaruga are joined by a new squad member, Otori Ouka, an elite who'd lost her license for unusual reasons. The squad witnesses her impressive skills.

Takeru told Ouka, "I won't give up on trying to be your comrade." But then, while visiting a certain grave site, he learns the tragic reason Ouka hates witches. The deep sorrow in Ouka's eyes when she tells Takeru, "other people are obstacles for my revenge," renders Takeru speechless.

Sparks fly when Nikaido Mari, a Valhalla witch with amnesia, joins the Small Fry Platoon. Can they successfully guard her? Or will Haunted get to her first...

In the chairman's office, Ouka finds files documenting Mari's crimes... The next day, the Mock Battle Tournament has entered the second round: Kyoya's 15th Platoon against Takeru's 35th. But during the battle, Yoshimizu, Kyoya's childhood friend and platoon member, has strange black thorns burst out of her body! "I've come to rescue you, my sweet Mari-san!" Emerging from the black thorns is the necromancer, Haunted.

The 35th platoon investigates two cases: a mysterious love magic artifact from a night club, and a sea monster at a beach where summer won't end. Can they rack up the points they need for promotion?

During a mission, Takeru runs into his little sister, Kusanagi Kiseki, and reveals the shocking truth to the rest of the platoon.

Takeru hits a new low after Kiseki's request. He reflects on their past and where he stands now.

With Takeru gravely injured, Kiseki on a rampage, and Haunted wreaking havoc, Ouka decides to take matters into her own hands.