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Kazuma met Nobara in a group date and they were told that they looked very much alike. On the way back home after the group date, they both had a petty quarrel and Nobara accidentally fell from a dangerous height. She then turns into a child afterwards and forces Kazuma to take responsibility by dressing as her and attend her classes at school.
Nobara also starts to stay at Kazuma's house and as time goes by, they unconsiously begin to discover that they have so much in common apart from their face. [dareka]