A class observation day was scheduled to be held in Gaku's class. However, Gaku was worried that if Hayato took a day off to attend, it would cause inconvenience at his workplace and increase his workload.
Uhm... Sorry, it's not that.
Äh, ja. Nur …
Ah, sí, es que…
Ah, euh, si…
Ah... sì... ecco... scusa. 
Non è per lo sgombro.
S-Sim... Desculpa, o problema é com outra coisa.
А, да, просто...