4minute will be heading over to Japan next month to promote the Japanese version of their hit track, "Heart to Heart"! To prime for their comeback, the girls updated their Japanese homepage with various album jacket photos and pictures of their new concept. Divided into two different looks, the girls exude two charms with a sexy red and a fresh, innocent blue.�The girls are also busily preparing for Cube Entertainment's family concert, 'United Cube', on August 14th. "Heart to Heart" will be released on September 7th! Source + Photos: Star News via Naver