Kokoro by SS501

"Kokoro" is South Korean boy band SS501's debut Japanese maxi single.The group debuted in the Japanese market after only two years since their Korean debut to further spread their activities and challenge themselves outside of Korea. They released their Japanese single "Kokoro", alongside multiple versions, including one with all members and five featuring each member individually.Their lead track, "Kokoro" debuted at the 5th spot on the Oricon chart, and moved to 3rd spot the next day. It was also chosen as an ending theme song for an anime entitled Blue Dragon.