What is "ketsumeishi"

is a four-member Japanese pop and hip hop group that incorporates singing and rapping into their music. They have had several major hits in Japan, including " Sakura", which reached number two on the Oricon yearly chart for 2005 and was featured in the Japanese game Taiko no Tatsujin. Ketsumeishi is a Japanese word for a type of medical herbs made from the seeds of Senna obtusifolia, which is often used in Chinese medicine.