Ken Hirai is one of my favorite singer. Because He has an awesome voice that any other singer didn’t have, and his voice is also characterized himself. These are some Ken Hirai’s Song. Hope you like it !
「いつか離れる日が来ても」”Itsuka hanareru hi ga kite mo”
「眸をとじて」”Hitomi wo tojite”
Ken hirai not only singing slow and sad song :p but also the fun song