TYOSiN (トキオシン; born in 1987) is a Japanese rapper and singer originally from Adachi-ku (Adachi City), Tokyo. Previously known as KID NATHAN, he changed his stage name to TYOSiN in 2018. He has released several singles and EPs throughout his career, and he's known for his ever-changing and universal music style and lyrics. In 2021, the rock band Help Me Plyz debuted with TYOSiN as their lead vocalist, now going by the stage name "罪" (SiN).