Beauty is a sin -- so declares one day-dreaming Binan High student, who truly believes it. He tells the kind of lies even young children don't try to get away with, and everyone makes fun of him. But one day, the exchange students Beppu Akihiko and Haruhiko appear, and he is charmed by their sheer charisma. Who are these mysterious Beppu Twins? And will the Defense Club get to do anything this episode?!
That's a proper use of "speaking 
of which," at least.
Das ist wohl das richtige „übrigens“.
Ese es un buen uso del "hablando de eso".
Ese sí es un buen uso del "hablando de eso".
Cette fois, tu as bien utilisé
« à ce propos ».
Beh, almeno questo è 
un uso corretto di "a proposito".
Esse é um uso apropriado de 
 "falando nisso", pelo menos.