Tokyo, the imperial capital, where youkai exist behind people's lives. Hana, the daughter of the Viscount Tojo, who can see youkai from an early age and is loved by the youkai. It was my childhood friend Toranosuke, who also looks like a ghost, who always protected such a flower. Hana reunites with Toranosuke, the son of a former vassal of the Tojo family and is now an elite of the army, and has a faint love affair. However, Toranosuke has received a secret order from the army to subdue youkai !?