This is the story of ancient treasures watched over by Kashin Koji, reincarnated Sengoku warlords, and you——

An antique shop, Kicho-an, run by the immortal Kashin Koji.
The shop where you works.
you rescued a butterfly that had been caught by children and trapped in an insect cage, only to find that butterfly was the strange immortal man, Kashin Koji.

As a condition for releasing him from the cage, Kashin Koji offered skeptical you a job minding Kicho-an and a place to live.
you happily accepted the offer, but...
you became too favored by Kashin Koji.
If you ever tries to run away, he will transform into a butterfly and chase them to the ends of the earth.
Punishment and doting, obsession, blind love.
you becomes the one who fills the dizzyingly long solitude of Kashin Koji.

The regular customers of Kicho-an are reincarnated Sengoku warlords and daimyo who have retained their past-life memories—slightly dangerous folks.
To say nothing of ghosts, foxes, and demons who visit, calling Kashin Koji "Onichō."

Every day is thrilling at Kicho-an.
Kashin Koji's carrot and stick, and
the suspicious customers keep you on their toes——