The following is a list of all the items which become available when you reach a certain level. Once you reach level 13 and can obtain the Legendary assault rifle ("Warrior Assault Rifle") you will be able to obtain all in-game items (if luck is in your favour).
レベル2
レベル3
レベル4
レベル5
レベル6
レベル7
レベル8
レベル9
レベル10
レベル11
レベル12
レベル13