What is the piano song from Ep 18 13:12 of parasyte?
It is the piano version of "I Am", this melody is  included in the album 寄生獣 セイの格率 特典オリジナルサウンドトラック

you can listen to it here  https://www.youtube.com/watch?v=mXDbj4L2Y2U&amp;list=RDmXDbj4L2Y2U