it's an anime and also an otome game called Starry Sky. there's some manga based on it but they're just promotional material for the game. too bad.
oh no, don't cry. you can still read the manga. they're here in mangago. just search for 'starry sky' and you'll get a few titles. but they're open-ending manga, so be prepared. it's a reverse harem manga after all XD
manga or illustration????
http://www.mangago.me/read-manga/yuuwaku_recipe/mf/v01/c004.5/1/