C³ - CubexCursedxCurious

Unaired episode included with the fifth volume of the Blu-ray. The gang goes on a school trip.

One day, Yachi Haruaki receives a big black cube from his father, who works overseas. Overnight, the cube morphs into Fear, a tsundere loli who has turned up to remove the curse placed on her through accumulating negative emotions. At…

Haruaki arranges for Fear to join his school, where to his surprise, she ends up well-liked and happy. After her first day, she goes home with Haruaki and Konoha only to be attacked by a strange woman trying to kill the "Fear in Cube".

Using her power to the full to beat Peavey, Fear calls up various torture devices using her cube to attack her, including a massive guillotine that cuts off her left arm completely. Still in a crazed state, Fear attacks Haruaki before…

Haruaki and Fear are faced with a life-and-death decision when Mummymaker pays them a visit.

The final battle between the maniacal Worse Hunter Peavey Barowoi and Fear happens just as Yachi and Konoha are sidelined! Making matters worse, Kirika is a defenseless hostage... or is she?

After returning to school, Fear and Haruaki are contacted by the principal once again, who tells them that a certain student, Shiraho hasn’t been turning up. Coincidentally, Shiraho was recently sent a box containing a cursed tool, and…

Haruaki, Fear, Konoha and Kirika find some inconsistencies in Shiraho’s story, so they go to check her out in the school records. When they see a picture of Sovereignty instead, they realize that the identities of the two girls aren’t…

Fear, Konoha and Kirika lure Sovereignty out by threatening to kill Shiraho, and Haruaki is forced to go along with their plan. After managing to call out all parts of the Killing Organ curse, Haruaki dispels the curse and Sovereignty and…

Kuroe, an old friend of Haruaki’s and also a former cursed tool, returns to town and sets up her previously closed beauty shop, attracting many customers on its reopening date. At the same time, a new enemy makes herself known to the…

Fear, Konoha and Haruaki hear about a series of murders that have begun in town, realizing that the culprit is in fact Alice. Though they go to apprehend her, she easily escapes and hints that the girls she is murdering all have something…

Kuroe offers to restrain herself and play karuta (!) until the suspicion on her has been lifted, but Alice arrives soon after and holds Haruaki, Kirika and Kuroe hostage. She tells Fear that the Vivolio Families want to lift the curse off…

The group begin their battle with Alice, only to find out that Alice’s magic mirror allows her to make solid duplicates of herself that last for 10 minutes, proven when Fear impales one of them through with a drill and has to watch as the…