Prof. Otsuki (大月先生 Ōtsuki Sensei), also known as Kim, is a character in Let's Attack Crazy Cross.
Otsuki is a teacher at the Marutama High School. He was a former teacher at the Kanto Imperial University Graduate School of Physics, from where he left after making a plastic surgery to keep his good looks. Because of the surgery, he has to apply a facial tonic every two hours otherwise his face starts melting. The Crazy Cross Class is B+.