Itou Serika is one of the participants in JAXA's new astronaut exam. She loves food and Star Wars. After meeting her, Mutta quickly develops a crush on her.

After her father's death due to a rare illness which could not be cured at that time, she set out to become an astronaut and develop new cures for rare diseases and illnesses aboard the International Space Station.

(Source: Uchuu Kyoudai Wikia)