Mitsuki and the other kids put their plan into effect to make the singing contest happen and to save their school once and for all.
You shouldn't eavesdrop like that. It's rude.
لا يجب أن تتنصت هكذا، إنها  
.فظاظة
Man soll doch nicht lauschen.
Es de mala educación fisgonear así.
Você não deveria bisbilhotar desse jeito.
É falta de educação.