Otome no Inori (乙女の祈り; A Maiden's Prayer) is the 1st major single by Mano Erina. It was released in limited A, limited B, limited C, and regular edition, limited A coming with a bonus DVD, limited B coming with a mini photobook, and limited C coming with a serial number card used to enter a lottery where tickets could be won to an event. The single reached #5 on the Oricon charts, charted for five weeks, and sold a total of 25,228 copies. The single was released on March 18, 2009, and the Single V on March 25, 2009. Currently, it is her highest selling single.