She is Rokka's sister in law, and often drops by the shop to either watch over it or help out when needed.   (Source: ANN) 

Hazuki may be near-sighted, but he knows true beauty when he sees it and the delicate form of flower shop owner Rokka draws him in like a bee to honey. So, hoping to cultivate a relationship between them, Hazuki takes a part time job at her shop, only to discover two huge thorns preventing the nurturing of any romance. The first, the fact that Rokka is still grieving for her late husband Shimao, would be enough to snip most men's ardor short, but it's the second that really threatens to make Hazuki's forlorn hopes wilt. Because while Shimao is most definitely deceased, he hasn't yet departed and his spirit is still living in Rokka's apartment! Except only Hazuki can see him, which leads to a very strange romantic triangle indeed. Are Hazuki's chances with Rokka as dead as the man who still lives in her house? Or can he somehow make love blossom even though there's an interloper pushing up the daisies between them? 
(Source: Sentai Filmworks)

A young man with poor eyesight named Hazuki works part-time in a flower shop and falls hard for the shop-owner Rokka. But what happens when he discovers that residing in her apartment is the spirit of the man she can never forget? 
(Source: Stiletto Heels) 
Note: Chapter count includes one extra chapter.

Miho Shimao