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