After learning about the “Seven Mysteries” at the Ninja Academy, Himawari and several of her classmates decide to go investigate at night. Kae is among the participants, so Kawaki has no choice but to go along. But he learns that Kae does not believe in the Seven Wonders and is trying to create a fake phenomenon for the students who are looking forward to the expedition. Seeing Kae’s eagerness and excitement, Kawaki decides to help her until the end, but then something mysterious and unexpected occurs.
I can't believe the next one is
the last of the Seven Mysteries.
.لا أصدّق أنّ التالي هو اللغز الأخير
Schade, dass wir beim letzten
der Sieben Mysterien sind.
La próxima maravilla es la última.
La próxima maravilla es la última.
Quindi il prossimo 
è l'ultimo dei sette misteri...
Não acredito que o próximo
é o último dos sete mistérios.
А ведь впереди
 осталась всего одна тайна…