One of the older yuri manga out there. Resine comes to a new boarding school to find she is rooming with Simone, a rebel who is rude to her from the start. However, Resine and Simone end up falling in love...
Be warned, as this is an older manga, you shouldn't expect a happy ending. If you want a happy ending, stop reading after the third part and pretend they lived happily ever after. ;)