Hana wa Kurenai

From MangaHelpers: Country boy Midori has just moved to Tokyo to work at a job that he landed through family connections. His naïve and extremely honest personality makes him an easy target in the big city, but, at the same time, the women seem to fall in love with him. He's still a virgin and thinks that he should only have sex with the woman that he truly loves and this is also the other reason he moved to Tokyo: to find a wife. He starts working at his new company under mysterious circumstances and his love life causes Midori to have problems he has never experienced before.