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.
My days as a detective had only just begun.
أيّامي كمحقِّق قد بدأت للتو
Meine Tage als Detektiv
haben gerade erst begonnen.
Mis días como detective, acaban de empezar.
Mis días como detective acaban de empezar.
Ma carrière de détective
I miei giorni come detective... 
sono appena iniziati.
Minha vida como detetive
 está só começando.