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.
And if he takes the day off,
he'll have to make up for that missed work.
Und würde er sich freinehmen,
hätte er hinterher umso mehr zu tun.
Además, si falta al trabajo,
luego estará aún más ocupado.
Et puis, s’il prend un jour de congé,
E se si prendesse un giorno libero, 
dovrebbe recuperare quello che non ha fatto.
E, se ele tirar o dia de folga,
precisará compensar depois.
К тому же, если он пропустит работу,
ему придётся потом отрабатывать.