Natsuki

An animal that appeared at Chihaya's school. He appears to be similar to a rabbit but is an unknown animal and the school nurse wished to dissect him when he was captured. Chihaya rescued him and took him to her house, though problems arose with her parents as animals are not permitted in the restaurant. Natsuki revealed himself to be a person from Evergreen, a magical land. He appears as an animal due to lack of magical energy.

(Source: Wikipedia)