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About : Mitsui is a student of Hikarizaka Private High School. She talked with Fuko for a bit during the school's entrance ceremony before her accident. Though she remembers Fuko, she refuses to accept Fuko's starfish sculpture gift and request to go to her sister's wedding, since she is a senior and is busy with entrance exams. This hurts Fuko's feelings. In The Older and Younger Sister's Founder's Festival, she finally accepts Fuko's gift after seeing that she continued to give them out to people. She...