Orange Planet by Fukushima Haruka

I kinda like the story, since I am a student-teacher relationship admirer. xD

Rui, the main protagonist, met a guy when she was mourning for the loss of her parents. The guy, who was slightly older than her, told her that for her to cheer up, he will give her a gift: the brightest star in the night sky. Glistening against the darkness from spring until winter. Haru, was the guy. A few years after, Rui never saw Haru again, yet she still wishes to meet him, sending him written messages everyday, and she comes home everyday as well, without a reply from him. This one-sided relationship became an unimaginable harem, once her best friend, Tarou, starts developing feelings for her, and Kaoru, her crush, starts liking her back. Under crazy circumstances, Rui ends up living in the same house as her teacher! 

I wont write anything else, because those who wants to read the manga might get spoiled… Also, I haven’t finished reading it yet. )

This Manga is only available to be read online in www.onemanga.com