First of all, where do you live? If you are in the far North (zone 5) it might be too early to plant it outside if there is still danger of freezes. Either a CQ or Tamukeyama should be able to handle full sun in the North because they can handle it in the Southeast. However, if the tree has been growing in the shade at the store, you may need to gradually move it into more sunlight.

The leaves on your tree probably shriveled up due to lack of moisture. Winds will really dry out plants fast, particularly in containers. Also, nursery grown plants in pots are often grown in soil that is nearly pure bark, which drains and dries out very quickly. You should water it daily until you plant unless it rains. Try to plant it as soon as possible, either in the ground or in a larger pot with good potting soil. If you want it in the ground, I would go ahead and plant now rather than waiting until fall. You want it to establish roots as soon as possible before winter.

BTW, don't keep the tree in your house. If there is freeze danger, move it into your garage or some other protected area that is unheated. A house is just too dry for trees except very temporarily.