this is a Japanese drama "my elder sister is devil".
please follow the number one by one.there is Chinese language supervisor.
http://www.youtube.com/watch?v=F38Y4Kf8LMA
theme song is Okumura Hatsune奥村初音's "Hontowaneホントはね".
http://www.youtube.com/watch?v=0u13ztnG9E0