If you pick up items while hunting, you can check them in inventory window.
You can go to the Inn Hostess to store items and Noahs. Window appears by right-click while the NPC is selected.
* You can purchase cash items by clicking Power Up Store
Warehouse creates once you click Use Storage. (Warehouse area on the top and own inventory on the bottom.)The usage is same as trading; drag and drop. If you click Noah image, setting page appears to decide how much you want to store in the Warehouse. At that time, please insert the amount and click confirm for store. At the last, close the window.
* Warehouse is shared by your account characters on each server.