It's too soon to celebrate summer vacation for Mumei and his classmates. Something seems off about Miss Ou. With the moon creeping ever closer, Mumei learns that even his Shokatsu Technique isn't invincible.  With the Earth and Haku's life on the line, one final test will put Mumei and the others through the ringer. Is there really anything the Shokatsu Technique can't solve?
Once the closing ceremony is over today, 
it'll finally be summer vacation.
بعد انتهاء الحفل الختامي، ستحين العطلة الصيفية أخيراً
Nach der Abschlusszeremonie später
sind endlich Sommerferien …
Cuando termine la ceremonia de clausura,
ya estaremos en vacaciones.
Cuando termine la ceremonia de clausura,
ya estaremos en vacaciones.
Après la cérémonie de fin de trimestre,
ce sera enfin les vacances d’été.
Una volta finita la cerimonia di chiusura
ci sia aspettano le vacanze!
Quando acabar a cerimônia de encerramento,
 finalmente vamos entrar de férias!