Adaptation of the final chapters of the Saiki Kusuo no Ψ-nan manga.

Idol-obsessed Kousaku Hata is left devastated when his favorite, Yuka Kusakabe, unexpectedly announces her retirement at the peak of an illustrious career. As Yuka’s biggest fan, this news proves to be more difficult than he can bear. Shaken to his very core, he sinks into depression and places himself in self-imposed isolation. However, on the day his friends managed to convince him to attend school again, he gets a pleasant surprise. It turns out that his beloved idol, under the guise of Ringo Kinoshita, has transferred into his class. This miraculous development fills Kousaku with newfound resolve, as he dedicates himself to take advantage of the once-in-a-lifetime opportunity. With the support of his teacher and friends, Kousaku works toward getting close to the girl of his dreams and uncovering the reason for her retirement from the entertainment industry. [Written by MAL Rewrite]

When swords were outlawed in the eleventh year of the Meiji Era, the mighty samurai population began to dwindle. Those who rejected the ban on blades rebelled, causing violent unrest to erupt throughout the countryside. To combat the rise in criminal activity, an inescapable lake prison was constructed. Three young men, born of the Kumoh line, were given the duty of delivering criminals to their place of confinement—but could there be more to their mission than meets the eye? (Source: FUNimation)

The world has become a slaughtering ground for the Crimson Denizens, mysterious beings from a parallel universe who thrive on the life energy of humans. These merciless murderers only leave behind scant remainders of souls called "Torches," which are mere residues that will eventually be destroyed, along with the very fact of the victims' existence from the minds of the living. In an ambitious endeavor to put an end to this invisible, hungry massacre, warriors called Flame Hazes relentlessly fight these monsters. One fateful day, Yuuji Sakai ceases to be a regular high schooler—he becomes trapped in a crevice of time and is suddenly attacked by a Denizen. Coming to his rescue just in the nick of time is a nameless hunter who seems no different from an ordinary young girl except for her blazing eyes and burning crimson hair. However, before Yuuji can learn anything more about his situation, he discovers that he has already been reduced to a Torch—merely a scrap of memory waiting to be extinguished. [Written by MAL Rewrite]