From Which Scanlations:
With a boyfriend who's an idol on the rise and a wacky grandfather who has a penchant for inventing and Japanese history, Hana's life is crazy enough. Things get even more complicated when Hana runs into a burning building, trying to rescue her grandfather, and finds herself face-to-face with a man who seems to be a samurai from the past...
Title: Sengoku Danshi Hana no Ran
Author & Artist: SUMOMO Momo
Genre: Fantasy | Historical | Romance | Shoujo
Status: 5 Volumes (Complete)
Vol. 4fixed - Mirror