Wataru Ichinose

Before he was a protector, Kenshin was a fearsome assassin known as Battosai. But when he meets gentle Tomoe Yukishiro, a beautiful young woman who carries a huge burden in her heart, his life will change forever.

Humanity is under attack by human-mimicking flesh-eating alien parasites. One parasite bonds with his young high school student host, and he convinces the parasite to help him stop the others.

Manji, a highly skilled samurai, becomes cursed with immortality after a legendary battle. Haunted by the brutal murder of his sister, Manji knows that only fighting evil will regain his soul. He promises to help a young girl named Rin avenge her parents, who were killed by a group of master swordsmen led by ruthless warrior Anotsu. The mission will change Manji in ways he could never imagine.

In an era where aliens have invaded and taken over feudal Tokyo, a young samurai finds work however he can.