Shoujo Jiten

Girls are creatures that are full of mysteries. In a dilapidated dormitory for girls, Yachiko who has run away from home meets Giko, the crevice ghost. Peeping on and observing girls, that is Giko's goal, all to unravel the mysteries that is a girl and to note them in his "Girls Dictionary?!"

Link to the author's animations on their website:
http://amagoyasairuiu.web.fc2.com/link.html