You should read "Tadaima, okaeri"
I would recommend Mushishi, tho it has its fair share of sad chapters, but I read this when I was depressed and it helped me. Other recommendations would be :
http://www.mangago.me/read-manga/boku_dake_ga_inai_machi/
http://www.mangago.me/read-manga/kakukaku_shikajika/
http://www.mangago.me/read-manga/totsukuni_no_shoujo/
http://www.mangago.me/read-manga/houseki_no_kuni/
All of them are both sad and beautiful but also very healing.
I also heard Solanin is pretty good, though I have yet to read it.
Perhaps this one: http://www.mangago.me/read-manga/kareshi_toshishitakei/ ?? It's a good story though if you like romance shoujo type manga. You should try it. ^^
Please recommend me a really beautiful manga.
In feeling really depressed rn so I want something really beautiful to distract me. I don't mind if it's yaoi/Shounen ai but I would prefer if it wasn't.
In want something to restore my Faith in humanity.