Four years after his father's death, a young man is trapped in a seemingly endless cycle of grief. However, after the arrival of a sickly houseplant, he soon finds himself embroiled in the oddest hobby, meeting the oddest people, in the oddest little plant shop located in the Kohaku Shopping Center. Welcome to the Shop on Yarrow Street. How can we help you today?

Watson looked at it, this great monstrosity of darkness, of anger, of hatred, of rot and pestilence. Its gaping maw dripped with blood and hair and flesh. He could hear Holmes sobbing behind him, begging him to make it stop. The good doctor could only fall to his knees and embrace his friend, whispering words of love and comfort, waiting for that beast to consume them all.