R☆L滑舌探求歌 (R☆L Katsuzetsu Tankyu Uta)

R L Katsuzetsu Tankyu Uta is a song sung by Rin Kagamine and Len Kagamine. It is the two-hundred-and-twelfth track in Other Vocaloid Songs 10: Luka And Rin and the forty-ninth track in Other Vocaloid Songs 25: Mostly Len.