Ryuken has been murdered! If they want to get their student ID, the three brothers must find the true culprit. When Ryuken and Yuria take a tumble down the stairs together, they accidentally switch bodies. The strange situation is complicated even further when Shin arrives... Thouzer and his gang make their passionate singing debut as Nanto DE5MEN's first single is unveiled.
If the adults can't find the culprit, 
then I have to do it.
إن لم يستطع الكبار معرفة القاتل، يحينُ دوري حينها
Wenn die Erwachsenen es
nicht schaffen, muss ich ran.
Si los adultos no encuentran 
al asesino, tengo que hacerlo yo.
Si los adultos no encuentran 
al asesino, tengo que hacerlo yo.
Quand les adultes
ne trouvent pas le coupable,
Se gli adulti non sono in grado di catturare 
un criminale, allora tocca a me farlo.
Se os adultos não conseguem achar
 o culpado, cabe a mim achar!