Yuji's on his way home from high school when a red-haired girl with fiery eyes and a sword of flame suddenly cuts him down in a battle with demon-like beings that are consuming human lives. This girl tells Yuji he's dead--but how is he still moving?
Yuji demands to know more about his fate. The fiery-eyed warrior callously explains how the world really works on a supernatural level. Naturally, Yuji struggles to keep his friend from fading from existence.
Shana keeps a close eye on Yuji--by replacing his friend in his high school class! Yuji struggles to grasp the situation, but he puts his own existence on the line when an evil little doll returns with her master.
Shana moves into Yuji's bedroom, but she is surprised to find that something about him has a strange effect on her. Later, a voluptuous librarian who's actually a boozing Flame Haze comes to the city and attacks Shana!
While on a date at an art exhibit, Yuji receives a warning from the Corpse Collector. Margery Daw arrives on the scene, but a creepy doll master Denizen takes the liberty to interrupt.
Friagne cooks up a plan to keep the two Flame Hazes occupied while he devours the entire city! When the Denizen sparks up a battle, Shana dawns on a newfound strength from Yuji's presence.
Yuji begins training to help fight the Crimson Denizens, but Shana turns out to be a slave-driver. When Margery Daw tracks down the Corpse Collector, Shana and Yuji must stop her before she destroys the whole city!
When Yuji's class gets free tickets to the waterpark, a classmate can't resist asking him out with the group. Shana gives the human pastime a try, but she makes a big splash when hidden feelings start to surface!
Shana is as relentless as ever in Yuji's battle training. But when he chooses school responsibilities over a special session they'd planned, she gets burned--and realizes another new emotion while taking on a desperate Rinne without him.
Shana's curiosity leads her to research the concept of a kiss. New Denizens take residence in Yuji's town--and one of the lip-locked twins sniff out Shana's presence.
Kazumi finally makes a stand about her feelings, sending the girl contending for Yuji's attention into a rage. When the creepy twin Denizens put up a seal, Shana takes them on outnumbered.