After Bossun drinks another one of Chuu-sensei's concoctions, his feelings and expressions become mismatched! And then, Bossun becomes an origami master, but can he overcome nervous jitters to win a major contest?
And when he's being serious, 
he looks embarrassed.
Cuando está serio, pone cara de vergüenza.
Y cuando habla en serio, parece avergonzado.
E quando está sério, parece envergonhado.