Kazuki Aikawa (Issey Takahashi) teaches "Animal Behavior" at the university, which studies animal behavior. He just started his life as a lecturer half a year ago, but he likes all kinds of creatures too much and is obsessed with research. He even doesn't follow the rules of the university, and he is criticized in the workplace every day. He doesn't keep time very well, and his dentist complains that he has no common sense. Kazuki is very honest, and sometimes he directly answers students' questions with "I don't know", which confuses students. His persistence in his interests and his non-conformity also affect the values of those around him.