To clear 5 missions, The last option in the Main Menu gives you objectives to tell you how to beat it, the majority of Missions 1-4 are story related (Normal Tab), 5 is for using all AP total in 1 play session, and 6 is for using a Continue Ticket, simply do these and head back to the "Mission" menu to earn prizes, such as more AP Potions and Continue Tickets. (Note: Missions 5 and 6 either, can only be completed over and over daily [once each day].)