Looking for a manga where the two main characters (both boys) are cursed and they have to spend a certain amount of days with each other without dying to escape the curse, except their ancestors have never succeeded before.
http://www.mangago.me/read-manga/saiyaku_wa_boku_o_suki_sugiru/
This is it! Thank you! XD
Looking for a manga where the two main characters (both boys) are cursed and they have to spend a certain amount of days with each other without dying to escape the curse, except their ancestors have never succeeded before.