My first anime was Princess Tutu(This was before I knew what anime was! Still my favorite one EVER!), and my first manga was Yumeiro Patissiere. Such a good manga! The anime is totally different
I just watch anime since when I was a child so I can't remember my very first (I swear, I should have been 3 or 4) but my first manga were Hokuto no Ken and City Hunter and then Sailor Moon reply
