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IF (voiced by Kana Ueda)
A girl of strong character who lives with Compa. At the same time, she suspects she suffers from Middle School 2nd Year Syndrome. She is investigating underwater cities, and her notes about how to go to them may or may not have a reputation for being legible.
Compa (voiced by Kana Sakai)
A naturally clumsy girl who lives with IF. She is always smiling and goes about her day with IF as if conjoined at the hip. With high girl power, she is considerably talented at cooking and skilled in the treatment of injuries.