1boy animated audible_music backpack bag black_footwear black_hair blue_background blue_eyes blue_hat blue_shorts chibikki commentary derivative_work flute full_body grey_socks halo hat instrument kneehighs kyoufuu_all_back_(vocaloid) male_focus music original playing_flute playing_instrument randoseru recorder red_bag sailor_collar sailor_hat sailor_shirt shirt short_hair short_sleeves shorts simple_background socks solo sound symbol-only_commentary very_short_hair video
1boy backpack bag black_footwear black_hair blue_background blue_eyes blue_hat blue_shorts flute full_body grey_socks halo hat instrument kneehighs male_focus music playing_flute playing_instrument randoseru recorder red_bag sailor_collar sailor_hat sailor_shirt shirt short_hair short_sleeves shorts simple_background socks solo very_short_hair
kyoufuu_all_back_(vocaloid) original
animated audible_music commentary derivative_work sound symbol-only_commentary video