What kind of title is this?: Manga.
Where can I read it?: Reading links are listed for Official Site, Kodansha USA, Seven Seas Entertainment. Check availability in your region.

Synopsis

About My Deer Friend Nokotan

Girl meets elk-girl—and chaos ensues! No one knows Torako used to be a delinquent. All of her classmates only know her as the perfect student. But everything changes when Nokotan, a transfer student with antlers, enters her life. Antlers aren’t the only thing strange about Nokotan. Her deer nose can sniff out Torako’s secret past! Whether it’s at school or the zoo, chaos follows this doe-eyed girl’s every step. Torako has so many questions! Is Nokotan a deer, a girl, or something in-between? (Source: Seven Seas Entertainment)

Comedy Fantasy Slice of Life