Nani Sore Ai ka yo

Iida, an office worker who wears a fake smile daily, gets roped into running the flower shop owned by another fake-smile wearer, Yoshida. As they spend time together, the two of them open up their true selves to each other, eventually becoming the first in each other's minds. Between two guys seemingly uninterested in romance, what is it that draws them to each other?
(Spin-off of 'Ao to Midori' by the same author, might be best to read that first although not exactly required)