Ordinary Person Mask

Protect your sister and commit a crime. Ootaka Kokuto, a high school boy born with a heart condition, moves to Hokkaido with his twin sister, Katsumi, to recuperate. While he has become friendly with his classmates, a certain incident triggers major changes in his mind and body. To protect his beloved sister, he transcends all restrictions. Here comes the demon in human skin, Ordinary Person Mask!!!