From Kodansha:
Shinoha is a young Ninja who cannot smile or laugh because of childhood trauma. Kiwami is among the elite at a successful company…but he has a secret! Behind the scenes, he is a Gokudo…head of his own kumi. The two meet just as the flames of conflict in a 300-year war between the Ninja and the Gokudo grow hotter! Lonely souls fight to the death in this tale tinted with passion and sorrow! The Ninja and the Gokudo are about to settle it once and for all…which side will survive, and which side will face annihilation?