Moving to Ikebukoro was the biggest mistake of his life, or so was Nanase Shou's idea. He is running low on his savings, hasn't found a job yet and not to mention a few debts here and there was making his life a complete hell until one Saturday morning, he shares his breakfast with a little girl wearing a..... kosode? What would happen when Shou has to babysit a brat whose soul objective is to frustrate him by playing pranks all day? Will he stick with her through her annoying pranks until he finds out the truth behind her and the consequent changes in his life?