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The three Minami sisters – Haruka, Kana, and Chiaki – only have each other as they navigate the pitfalls (and pratfalls) of every day life, love and friendships.
Life for the Minami sisters carries on as normal. Chiaki continues to idolize and adore her eldest sister; Kana is as lazy and absent-minded as ever; and Haruka is trying to hold the entire family together. With their apartment acting as a drop-in center for their sensitive and somewhat pathetic uncle, and a friendly hangout for their friends, the trio are never lonely or bored. From getting their fortunes during a new year’s shrine visit, to discussing the recent cup yakisoba phenomenon, or even debating moral dilemmas, no subject is too trivial or too grand for these sisters to handle. No matter what lay ahead for Haruka, Kana, and Chiaki, there will always be room for one more under the kotatsu.
It’s a new year, but little has changed for the Minami household. Chiaki has been given the job of nutritionist for her class's new hamster, and uses the same techniques to care for it that she learned while studying Kanna; Haruka is still suffering from the greatly-exaggerated rumors that she was once a mob boss back in her middle school; and Kanna is as hyperactive as ever, always forcing her friends into awkward situations (including cross-dressing, litter picking and forming an army)! But despite their troubles, the three sisters stick together and always manage to have fun!
Life for the Minami sisters continues to plod along as it always has. Hosaka persists in his quest to win Haruka over with his cooking; ‘Mako-chan’ is still trying to hide her identity from her oblivious classmates; and the biggest change to hit the family yet: Chiaki begins eating her carrots! With Valentine’s Day fast approaching, Kana attempts to put her secret plan into action by building up everyone’s enthusiasm so she can secretly eat some of the chocolate they make. However, the girls aren’t the only ones making their preparations. While Hosaka plans for the perfect way to accept chocolate from Haruka, Fujioka endeavours to make a clueless Kana notice him...
Tomoya’s father remarries to another woman, giving him a stepsister, Ichika. However Ichika is 17-years old and has completely fallen in love with her stepbrother who is only 13!