TV-Series
Description
Chiaki Komatsu is a student who attends the Ipponmatsu Cram School alongside the series' protagonist, Mayuko Chigasaki. She is a bespectacled girl who approaches Mayuko and becomes a close friend after they begin school together.

Chiaki's most defining characteristic is that she is a severe UFO and alien otaku, a fanatic whose enthusiasm can run wild. Her passion for extraterrestrials gives her a romanticized view of contact with them, leading her to feel somewhat regretful that aliens have become a commonplace part of everyday life, which diminishes the wonder of such an encounter. She is often seen carrying a laptop adorned with alien stickers.

In contrast to the introverted and financially struggling Mayuko, Chiaki possesses a bright, easygoing, and harmonious personality that allows her to make friends easily at school. She comes from a wealthy family, with her parents living in the United States, and she shows no signs of experiencing the poverty that defines Mayuko's daily life. Chiaki has a longing for Mayuko's situation, as Mayuko actually lives with a real alien, NieA. This fascination sometimes leads Chiaki to fall for NieA's tricks or get caught up in troublesome situations, making her a secret troublemaker alongside NieA, with Mayuko frequently left to clean up the resulting chaos. She visits Mayuko's village whenever she has free time, claiming an appreciation for its old buildings, though her primary motivation is likely the alien connection.

One of her key roles in the story is as a contrast and friend to the gloomy Mayuko, who sometimes questions whether someone like Chiaki would genuinely want to associate with her. However, contrary to Mayuko's insecurities, Chiaki treats her friend wholeheartedly. Her relationship with Mayuko also highlights themes of social and economic disparity, as Chiaki's material comfort and worry-free upbringing stand in stark relief to Mayuko's constant struggles to make ends meet. While she is a diligent student like Mayuko, her grades are not portrayed as being particularly strong.

Chiaki does not possess any supernatural or special abilities. Her notable attributes are her extensive knowledge of ufology, her outgoing social skills, and her persistent, cheerful nature that allows her to bridge the gap between her own privileged life and Mayuko's much harsher reality.