Kono Mune no Tokimeki wo (この胸のときめきを; This Throbbing Heart) is the 4th major single by Mano Erina. The single was released on September 30, 2009 in 3 Limited Editions, and Regular Editions with both the Limited A and B coming with bonus DVDs. All three limited editions came with a card used to enter an event. The single reached #7 on the Oricon charts and charted for three weeks, selling 16,568 copies. S/mileage is featured as back-up dancers in the PV and accompany Mano in live performances of the song.