If you're looking for manga similar to Akuma-kun Movie, you might like these titles.
Akatsuki: a powerful demon of illness, which infects victims, turning their eyes red, and slowly kills them. Usually, they take the form of a strong monster connected to the victim's body. The only way to cure the victims infected with Akatsuki is to slash the victim's body with special anti-Akatsuki weapons, known as "Crave." The people who possess and use these weapons are called "Kiri-Isha" (Slash Doctors). Hibiki, the protagonist of this story, is a Kiri-isha. He is partnered with Kirisa, another Kiri-Isha. Their mission is to cure people infected with Akatsuki.
Why do monsters drop "items" that are useful for the hero? --The unknown relationship between the heroes and the Demon King's army is depicted with MAX cuteness!
Ten years ago, a terrible virus swept the globe. It turned its victims into bloodthirsty monsters called Dracules, and the only cure is death. Now, with humankind on the brink of extinction, only the elite warriors of the Vius Squad stand between chaos and civilization. New recruit Leila Mikami is one of the squad's most promising young warriors, but she has another agenda: Her parents were killed by a Dracule, and she's determined to take revenge. To do this, she has to find the Dragon Eye - a magic weapon that will make her the most powerful warrior in the world.