Hayato and Ui are enjoying a relaxing evening at home eating dinner and studying. But they're bothered by Rin's numerous visits to her sister's place next door.
Her duty as a disciplinary 
committee head, or whatever.
Ihre so genannte Pflicht als Disziplinarkomitee.
Lo de ser del comité disciplinario.
Es del comité disciplinario.
Che è suo dovere come Capo
della Disciplinare, o qualcosa del genere.
Diz que é um dever do Comitê
 Disciplinar e coisa e tal.