兄妹ユニット【Seira】brother and sister duo singers Website▶︎https://seira20130214.wixsite.com/officialsite Twitter▶︎https://twitter.com/Seira2013 Vocal:Uh. YouTube▶︎https://www.youtube.com/channel/UC9QfMq6FZysvIqHri7Wv96Q Twitter▶︎https://twitter.com/0720Seira Instagram▶︎https://www.instagram.com/0720seira/ Guitar,Chorus:Sangdae Twitter▶︎https://twitter.com/1223Seira Instagram▶︎https://www.instagram.co