You finish episode 12, sit in it a while, then find this tucked into the second BD box like a thank-you note to the people who actually paid. Knight Busters Inc. is Matoi Sumeragi off the clock, the girl who spent twelve episodes crying that she just wanted a normal life while gods kept hitching rides in her body. It's Tenman Shrine with the pressure off: Yuma Kusanagi, who wanted the sacred slayer job and watched her best friend get drafted instead, Clarus Tonitrus at full volume, Shingo still fumbling at fathering a daughter he only got back three months ago. Nobody puts Inc. in a title when they're planning to break your heart. This never aired because it was never for broadcast, it was for you, the one who stayed through Kamaya's worst nights.
Matoi Sumeragi finally has the normal life she's been dreaming of, working alongside her best friend Yuma at Tenman Shrine while navigating the complexities of living with her father again. But normalcy doesn't last long. When supernatural threats emerge that demand more than standard shrine exorcism rituals, Matoi finds herself thrust into active combat alongside Yuma, discovering she possesses unexpected powers suited for direct confrontation with malevolent spirits. The two girls must balance their ordinary lives as junior high students with the extraordinary responsibility of protecting Kamaya from dark forces that traditional methods can't handle. As Matoi's abilities grow stronger, questions about her past and her mother's disappearance resurface, hinting that her role as a sacred slayer might be far more significant than she realized. This special episode continues their journey, deepening the bond between the girls while pushing them toward a greater purpose neither fully understands yet.