Kanpai! Vol 1

Kanpai! by Maki Murakami. A Comedy manga rated Teen, published in English by Tokyopop.

Shintaro Yamada is a monster guardian in training, raised by a talking rabbit named Ponta and sworn to protect supernatural creatures. When he transfers into Taino Middle School, he quickly becomes infatuated, not so much with his classmate Nao Arisaka as with the nape of her neck. A wacky supernatural comedy from Maki Murakami, creator of Gravitation.