Now that the choir has ten members, it's time to get serious about entering the Kanto boys choir competition! The boys find out that last year's national winners are performing at a festival, so they go to check them out. Then they run into Maiden's dad!
He's a wellspring of trouble. 
Just leave it be.
إنّه مصدر متاعب، دعه وشأنه
Il va causer des problèmes,
ne t’en mêle pas.
Quello porta solo guai,
cerchiamo di non intrometterci.
Isso é começo de encrenca.
Deixa quieto.
От него одни проблемы. Не иди за ним.