Thus far, Arai has successfully concealed her true identity from Kentarou, who doesn't suspect in the least that his huffy housemate is actually his dearest childhood friend, Shi-chan. But Kentarou's little sister sees right through Arai's disguise when she makes a surprise visit. Now Arai is at the mercy of the little devil's whims, lest anyone else find her out! But when Karen's future at Wakaba-Soh is threatened, Arai may be forced to expose herself as Shi-chan to Kentarou. Can his feelings for Shi-chan ever apply to Arai? Or has Karen already claimed his heart? Find out in the final volume of Welcome to Wakaba-Soh!