In 2013, T-ara made a second Japanese studio album. It is called "Treasure Box". This album made it to number four on the Oricon chart. It lead to two Oricon top five singles. These were "Sexy Love" and "Bunny Style!" (). T-ara also made their fifth Korean EP in 2013. It is called "Again" and made it to number two on the Gaon Album Chart. It lead to the single "Number Nine" (), which made it to number five on the Gaon Digital Chart. It also made it to number four on the Korea K-Pop Hot 100.