In their quest to build a rocket, Umika and her friends decide to visit Matataki, their classmate who is a skilled engineer, but doesn't attend classes. However, they soon find out that this mechanic's got one short fuse!
hasn't attended class... 
o-once since entering high school.
.لم تحضر الفصل... ولو مرّة منذ بداية الدّراسة
no ha asistido a ninguna clase
desde que empezamos la prepa.
no ha asistido a ninguna clase
desde que empezamos el instituto.
depuis la rentrée,
non è venuta a scuola nemmeno una volta
não veio a nenhuma aula d-desde
que começamos no ensino médio.
с начала учебного года…
ни разу на уроках не появлялась.