Can anybody tell me the name of the piano piece playing at 45:26?

http://www.crunchyroll.com/media-509038/alone-in-love-4/

And in this vid at 43:06

http://www.crunchyroll.com/media-509040/alone-in-love-5/

And this one at 41:30 and 59:44

http://www.crunchyroll.com/media-509044/alone-in-love-7/

And this at the beginning

http://www.crunchyroll.com/media-509046/alone-in-love-8/