General Dahlia is sent on a suicide mission to kill all the demons of the opposing side with her measly team, but just when she's about to die, she reveals her plan to take control of the situation: the black magic spell of the Soulbind. With a Soulbind, two people's hearts, bodies, and souls are connected, and if one person dies, so does the other. Putting the enemy's general, Xenos, under the spell with the compromise of letting her people go if he takes her hostage... How will Dahlia fare at the enemy's castle?