Tatsuya is the main male protagonist in the story. He is very knowledgeable about the moon and the Kingdom of Sphere because he has been interested in it since he was very young. He has this odd unconscious habit of pinching girls on the nose as a sign of affection. Tatsuya constantly finds enjoyment in teasing Natsuki about random things. He is quite loyal toward Feena and her aim to fulfill her mother's dream to reunite the Earth and Moon. SpoilerThough somewhat apprehensive about the homestay, Tatsuya eventually falls in love with the princess and their union cements the alliance between the two worlds.