A little sister who loves tight spaces and always tries to squeeze into them. One day, the older brother visits her room and finds an open suitcase. Thinking to help tidy up, he starts organizing its contents—unaware his sister is actually inside. Without realizing she's in it, he closes and locks the suitcase, then shoves it into a corner of the room as if it were just luggage. As time passes and the sister doesn't return home, the brother suddenly realizes—just who was inside that suitcase?