Serika Kurusugawa is a central character in the anime and visual novel series To Heart. She is known for her calm and mysterious personality and is a member of the school's Occult Research Club. Serika often conducts supernatural experiments and has a strong interest in the occult, which makes her stand out among her peers. Despite her reserved nature, she is caring towards her friends and plays a key role in introducing the protagonist to the world of the supernatural within the series.