ALL WORK AND NO PLAY ... Its Yuuta and Sakis first summer vacation as stepsiblings, and theyll be working at the same bookstore! As Sakis coworker, Yuuta begins to see a side of her he hadnt noticed before. But after observing her new coworker for a while, Shiori makes a dark observationif Saki doesnt ease up and stop pushing herself so hard, sooner or later shes going to fall apart. In order to help her, Yuuta will have to make a decision. Should he interfere in his stepsisters life, even if it means breaking their promise?