Directions of Love (A Shinogiyuu Story)

In this alternate universe, two rivaling clans agree to make peace to fight of a political leader trying to take over their land. However, during the gathering, the leader of Minami drops dead suddenly, leaving the clans back into war and chaos. Twelve years later, Shinobu, a young talented poisoner in the rivaling clan of Minami, of the rank hashira, is on a mission to infiltrate the other clan. But her mission stops short when she's captured and send to the prison, guarded by no other than Giyuu Tomioka.

Childhood grudges became enemies. Enemies became lovers.