The holidays are a season of love and romance, but Kosuke is acting suspicious. When he comes home, Natsuna smells perfume and finds an earring in his clothes...could it really be coincidence? Then on Valentine's, she spends all day baking Kosuke a cake...only for him to come home bearing tons of chocolate from his colleagues at work-the fancy stuff people give to their crushes! Natsuna needs to get to the bottom of this, or their relationship is headed for rough waters...