Sakurajima Chiharu (桜島 千春) was introduced as the person who saved Hasegawa Taizou's life two times. First, when he was going to hang himself. Second, when the students decided to either eat him or give him to a lion. She called Hasegawa Taizou as Mr. Pig. Later, she lived with Hasegawa when her mother fell ill and brought to the hospital. She was also the person who was infected by the contagious virus, MADAO 49, and got healed at another planet.