Shiina-kun no Torikemo Hyakka

Shiina is a serious man who has wanted to be a zoology professor since he was a child. He was infamous forcarrying around many massive books and now Shiina works diligently to train future zoologists at a university while looking after his childhood friend, Chitose. Chitose is also an associate professor of biology and walks around everywhere with penguins, making him quite infamous as well. This manga focuses on the trials, tribulations, and future of the young associate professor, Shiina.

(Source: the manga habit)

Included one-shot:
Volume 4: Bijutsu-kei Danshi