Natsumi Aizawa is one of the main characters in the anime series 'Natsuiro Kiseki'. She is a spirited and energetic girl with a strong sense of justice and determination. Natsumi is known for her athletic prowess and is a member of the school's tennis club. Her desire to keep her friendships intact, despite facing various challenges, is a central theme in the storyline. She is often seen taking the lead in the group's adventures, and her optimism and enthusiasm inspire her friends to believe in their shared dreams.