Devilman Lady, Devil Lady in the US. The "you" is Jun Fudo, a woman that transforms into a devil-looking monster to fight motherfuckers that also transform into monsters and lose themselves to the OMFG KILL instincts that all "devil beasts" have because of an illness that is the onset of evolution transferred by contact with a devil beast through any of the five senses
. The speaker is Kazumi, her hot jailbait friend and roommate after some devil beasts kill her family
. She doesn't know Jun is a devil beast.
BAD END because At the end of the show, Jun has to kill Kazumi, whose devil beast form is supposedly a hideous monster, never seen onscreen, to get enough power to fight the villain. Jun then loses both arms and is declared dead, so she has to wander the earth forever and ever. The last scene, though, is two kids with tails playing which is supposed to represent that devil beasts are socially accepted and the OMFG KILL instincts are fading out.