The story begins when high school student Kazuki Muto is killed one night saving a mysterious girl from a monster, only to wake up in his school dorm, believing it to have been a dream; however, he soon finds out that dream wasn't a dream at all when a giant serpentine monster attacks him and his sister. Tokiko Tsumura, the girl he saved, explains that the monster is a homunculus. Kazuki had been attacked and killed by it when he was rescuing her; however, she, feeling responsible for him, revived him by placing a Kakugane medallion in his chest, serving as a replacement heart.
Jun Fukuyama
Kazuki Muto
Ryoka Yuzuki
Tokiko Tsumura
Aya Hirano
Mahiro Muto
Hitomi Nabatame
Ouka Hayasaka
Kisho Taniyama
Shuusui Hayasaka
Masashi Ebara
Captain Bravo
Mitsuaki Madono
Koushaku Chouno
Sayuri Yahagi
Hanaka Busujima
Yu Kobayashi
Chitose Tateyama
Junko Minagawa
Madoka Maruyama
Kouki Harasawa
Deep Blessing Warrior
Katsumi Cho
Dr. Butterfly
